ABBR,TERM
0D,obvious deed
1AM,Air Mechanic 1st Class
1D,One-Dimensional
2AM,Air Mechanic 2nd Class
2D,Two-dimensional
2G,Second-generation mobile (cellular,wireless) telephone system
2LA,Two Letter Acronym
2Lt,2nd Lieutenant
3AM,Air Mechanic 3rd Class
3D,Three-Dimensional
3G,Third-generation mobile telephone system
3i,Investors In Industry (venture capitalists)
3M,Minnesota Mining and Manufacturing Company
4D,Four-Dimensional (usually three spatial plus one temporal dimension,sometimes four spatial ones)
4G,Fourth-generation mobile telephone system
4WD,Four-wheel drive
5D,Five-Dimensional
6D,Six-Dimensional
7D,Seven-Dimensional
8D,Eight-Dimensional
9D,Nine-Dimensional
A,Ampere
A10,Atlantic 10 Conference
A1C,Airman First Class
A4,European standard office paper size
AA,achieved availability,Alcoholics Anonymous,Armed Forces Americas (postal symbol),Aruba (FIPS 10-4 territory code),assembly area,Automobile Association,avenue of approach
aA,Attoampere
AAA,administration,authorization,and authentication,American Automobile Association ("Triple-A"),anti-aircraft artillery,Amateur Athletic Association (of England),Asistencia Asesoría y Administración (Spanish,"Assistance,Consulting,and Administration"—Mexican professional wrestling promotion)
AAAI,Association for the Advancement of Artificial Intelligence,formerly American Association for Artificial Intelligence
AAAS,American Association for the Advancement of Science
AAAV,Advanced Amphibious Assault Vehicle
AAC,American Athletic Conference,Army Air Corps (British Army)
AAD,analogue-analogue-digital (CD quality),Australian Antarctic Division
AADAC,Alberta Alcohol and Drug Abuse Commission
AADC,area air defense commander,amino acid decarboxylase,aromatic L-amino acid decarboxylase,Australian Antarctic Data Centre
AADD,Adult attention deficit disorder
AADT,annual average daily traffic
AAFC,U.S. Army Air Corps Ferrying Command (1941-1942),All-America Football Conference (1946-1949)
AAFES,Army and Air Force Exchange Service
AAIS,advanced airborne interceptor simulator
AAM,air-to-air missile
AAMOF,as a matter of fact
AAN,American Academy of Nursing
AANEAS,Anglo-Australian Near-Earth Asteroid Survey
AAODL,Atmospheric Aerosols and Optics Data Library
AAP,advanced acquisition plan,Allied administrative publication,American Academy of Pediatrics
AAPC,Accounting and Auditing Policy Committee
AAR,after-action review,Association of American Railroads
AARP,(i/s) American Association of Retired Persons (now officially known only by the initials)
AAS,Advanced Automation System,American Astronomical Society ("double-A-S")
AASPEM,advanced air-to-air system performance evaluation model
AAT,Australian Antarctic Territory
AAV,Amphibious Assault Vehicle
AAWC,anti-air warfare commander
AB,"Able Seaman (both the rank and the occupation),Alberta (postal symbol)"
ABA,Adriatic Basketball Association,American Bar Association,American Basketball Association,American Beverage Association,American Bicycle Association,American Birding Association,Australian Broadcasting Authority
ABB,ASEA Brown Boveri (Swiss-Swedish multinational company)
ABBA,"Agnetha,Benny,Björn,Anni-Frid (Swedish pop group)"
ABC,the first three letters of the Latin script known as the alphabet
ABC,"abstinence, be faithful, condoms"
ABC,Active Body Control
ABC,"airway, breathing, circulation"
ABC,"Alcoholic Beverage Commission"
ABC,alien big cat
ABC,always be careful
ABC,American-born Chinese
ABC,anti-lock brake controller
ABC,"atomic, biological, chemical"
ABCA,American,British and Canadian Armies (originally),Army Bureau of Current Affairs
ABCS,(U.S.) Army Battle Command System
ABET,Accreditation Board for Engineering and Technology
ABFIST,Advanced Bradley Full Crew Interactive Skills Trainer
ABGI,Addington-Barker Group International
ABIN,Agência Brasileira de Inteligência (Brazilian Intelligence Agency)
ABL,American Basketball League
ABLE,AirBorne Law Enforcement (police air support unit)
ABM,anti-ballistic missile,Asynchronous Balanced Mode,automated banking machine
ABMC,American Battle Monuments Commission
ABN,Australian Business Number (a number issued by the Australian government as registration of a business and used for taxation purposes)
ABPI,Association of the British Pharmaceutical Industry
ABRSM,Associated Board of the Royal Schools of Music
ABS,"acrylonitrile butadiene styrene, or: anti-lock braking system"
ABSA,Amalgamated Banks of South Africa ("ab-sa")
ABSTRIPS,abstraction-based STRIPS
ABV,Alcohol by volume
ABW,Aruba (ISO 3166 trigram)
Ac,Actinium
AC,"Adriamycin-Cyclophosphamide (chemotherapy),Air Conditioning,Aircraftman,Alternating Current,Altocumulus,ante Christum (Latin,"before Christ"; see BC),ante cibum (Latin,"before meals"),Antigua and Barbuda (FIPS 10-4 country code),Associazione Calcio (Italian,"football (soccer) club"),A/C,Air Conditioned/Conditioning,Aircraft"
aC,Attocoulomb
AC1,Aircraftman 1st Class
AC2,Aircraftman 2nd Class
ACA,"Affordable Care Act,shorthand for the Patient Protection and Affordable Care Act,commonly called 'Obamacare',Airspace Control Authority,Airspace Co-ordination Area,A Current Affair"
ACARS,Aircraft Communications Addressing and Reporting System
ACAS,Aboriginal Children's Advancement Society,Advisory,Conciliation and Arbitration Service
ACB,Asociación de Clubes de Baloncesto (Spanish for "Association of Basketball Clubs")
ACCA,The Association of Chartered Certified Accountants,Automatic Cloud Cover Assessment
ACCAC,"Awdurdod Cymwysterau,Cwricwlwm ac Asesu Cymru (Qualifications,Curriculum and Assessment Authority for Wales)"
ACCD,American Coalition of Citizens with Disabilities
ACCS,Air Communications and Control Squadron
ACDA,Arms Control & Disarmament Agency
ACDC,"Alternating Current Direct Current,the name of an Australian rock music band,a term for a bisexual person,A/Cdre,Air Commodore"
ACDT,"Apple Certified Desktop Technician,Australian Central Daylight Time"
ACES,"Aerolíneas Centrales de Colombia (Spanish,"Central Colombian Airlines"),Auxiliary Campus Enterprises and Services of Alfred State College"
ACF,"Administration for Children and Families,American Car and Foundry,American Culinary Federation"
ACHT,Average Call Hold Time
ACINT,Acoustic Intelligence
ACK,Acknowledge (telecommunications; cf. NAK)
ACL,"Access Control List,Anterior cruciate ligament; the initialism can also refer to an injury to this ligament.,Atlantic Coast Line Railroad"
ACLJ,American Center for Law and Justice
ACLOS,Automatic CLOS (missile control system)
ACLS,American Council of Learned Societies
ACLU,"American Civil Liberties Union,American Communist Lawyers Union (pejorative slang for the above)"
ACM,"many,including Association for Computing Machinery; see entry"
ACMC,(U.S.) Assistant Commandant of the Marine Corps
ACN,"Airborne Communications Node,Australian Company Number (number issued by the Australian government as registration of a limited liability company)"
ACNA,Anglican Church in North America
ACO,Airspace Control Order
ACOBA,Advisory Committee on Business Appointments
ACOG,American College of Obstetricians and Gynecologists
ACOM,(U.S.) Atlantic Command
ACORN,Association of Community Organizations for Reform Now
ACP,"African,Caribbean and Pacific Group of States,Air Control Point"
ACR,Advanced Concepts and Requirements
ACRI,African Crisis Initiative
ACRT,Advanced Concepts Research Tool simulator
ACS,"Affiliated Computer Services (NYSE ACS),Alaska Communications Service,American Cancer Society,American Chemical Society,Association of Caribbean States,Australian Computer Society"
ACSC,Army Command and Staff College (various nations)
ACST,American Cooperative School of Tunis
ACST,Australian Central Standard Time
ACT,"Adaptive Control of Thought (cognitive model),American College Test (ing Program),Australian Capital Territory (also postal symbol),ACT UP,AIDS Coalition to Unleash Power"
ACTD,Advanced Concept Technology Demonstration
ACTF,"(U.S.) Army Constructive Training Federation,Australian Children's Television Foundation,ACT-R,ACT-Rational (cognitive model),ACT-R/PM,ACT-R/Perceptual-Motor (cognitive model)"
ACTU,Australian Council of Trade Unions
ACU,American Conservative Union
ACUF,"Advisory Committee on Undersea Features,American Conservative Union Foundation"
AD,"Air Defence,Andorra (ISO 3166 digram),Anno Domini (Latin,"In the year of our Lord")"
ADA,"Air Defence Artillery,American Dental Association,Assistant District Attorney,Americans with Disabilities Act (see also the similar but non-acronymic Ada programming language)"
ADAC,Allgemeiner Deutscher Automobil-Club (German for "General German Automobile Club")
ADAGE,Air Defense Air to Ground Engagement (simulation)
ADAP,AIDS Drug Assistance Program
ADAS,Asiago-DLR Asteroid Survey
ADAT,Alesis Digital Audio Tape (recording format)
ADATS,"Agricultural Development and Training Society,Air Defence Anti-Tank System,Australian Defence Air Traffic System"
ADB,Asian Development Bank
ADC,"Aide De Camp,U.S. Air Defense Command (1946-1992),Apple Display Connector,Program Against Digital Counterfeiting of Currency"
ADD,"Analog Digital Digital (CD quality),Attention-Deficit Disorder,Administration on Developmental Disabilities"
ADDIE,Analyze Design Develop Implement and Evaluate
ADDNS,Advanced Deployable Day/Night Simulation
ADF,Australian Defence Force,African Development Foundation
ADGB,Air Defence of Great Britain
ADHD,Attention-Deficit Hyperactivity Disorder
ADHS,Attention-Deficit Hyperactivity Syndrome
ADI,Acceptable/Allowable Daily Intake
ADIZ,Air Defence Identification Zone
ADL,Anti-Defamation League
ADM,"Administrative,,Admiral,and the U.S. Public Health Service Commissioned Corps,Archer Daniels Midland,Assistant Deputy Minister"
ADOA,Air Defence Operations Area
ADP,"Adenosine DiPhosphate,Army Doctrine Publication (UK,Canada,Australia),Automatic/Automated Data Processing"
ADRG,Arc-second Raster Chart (ARC) Digitized Raster Graphics
ADS,"Active Denial System,Astrophysics Data System,Attention Deficit Syndrome"
ADSR,"Attack,Decay,Sustain,Release (sound envelope specification)"
ADT,Atlantic Daylight Time (UTC−3 hours)
ADTB,Army Doctrine and Training Bulletin
ADW,Air Defence Warning
AE,"Armed Forces Africa/Canada/Europe/Middle East (postal symbol),United Arab Emirates (ISO 3166 digram; FIPS 10-4 country code),Artix Entertainment,American Eagle,A&E, Arts & Entertainment Network,the original name for the U.S. TV channel now known as A&E Network"
AEDT,Australian Eastern Daylight Time
AEF,American Expeditionary Force
AEGIS,Airborne Early warning Ground environment Interface Segment (fake etymology)
AESR,Aeronautical Equipment Service Record
AEST,Australian Eastern Standard Time
aet,After extra time (Football)
AEW,"Airborne Early Warning,Airborne Electronic Warfare"
AF,"Afghanistan (FIPS 10-4 country code; ISO 3166 digram),Air Force,As f*ck"
aF,Attofarad
AFA,"U.S. Air Force Academy,Asociación del Fútbol Argentino (Spanish for 'Argentine Football Association')"
AFAIC,As Far As I'm Concerned
AFAICT,As Far As I Can Tell
AFAIK,As Far As I Know
AFAIR,As Far As I Remember/Recall
AFAM,Associazione Friulana di Astronomia e Meteorologia (Italian,"Friuli Association of Astronomy and Meteorology"),Department of African and Afro-American Studies,University of North Carolina at Chapel Hill — notable for its links to the school's academic-athletic scandal in the 2010s
AFATDS,Advanced Field Artillery Tactical Data System
AFC,American Football Conference,Asian Football Confederation
AFCEA,Armed Forces Communications and Electronics Association
AFDB,African Development Bank
AFES,Automatic Fire Extinguishing System
AFG,Afghanistan (ISO 3166 trigram)
AFI,French Territory of the Afars and Issas (ISO 3166 trigram; obsolete since 1977),"Agencia Federal de Investigaciónes" (México)
AFIS,Automated Fingerprint Identification System,American Forces Information Service
AFIST,Abrams Full Crew Interactive Skills Trainer
AFJ,April Fool's Joke
AFK,Away From Keyboard (Internet chat abbreviation)
AFL,American Federation of Labor,American Football League — either the 1960s league that merged into the National Football League,or one of several other leagues of American football,Arena Football League,Australian Football League,AFL-CIO,American Federation of Labor,Congress of Industrial Organizations
AFLAC,American Family Life Assurance Company of Columbus
AFM,Army Field Manual (UK; the U.S. more frequently uses just FM),Atomic Force Microscope,Aviation Fleet Maintenance
AFO,Association of Field Ornithologists
AFOSR,U.S. Air Force Office of Scientific Research
AFP,Agence France-Presse (French,"French Press Agency"),Australian Federal Police
AFQT,Armed Forces Qualification Test
AFRC,Air Force Reserve Command
AFRL,Air Force Research Laboratory
AFROTC,Air Force Reserve Officer Training Corps
AFRRI,(i,U.S.) Armed Forces Radiobiology Research Institute
AFRTS,Armed Forces Radio and Television Service
AFS,Active Front Steering,Air Facility Sub-System,Amniotic Fluid-derived Stem cell,AFS&A or AFSA,U.S. Air Force Studies and Analysis
AFSC,U.S. Air Force Staff College (obsolete; replaced with JFSC),U.S. Air Force Systems Command
AFSCN,U.S. Air Force Satellite Control Network
AFSPC,Air Force Space Command
AFT,American Farmland Trust
AFV,armoured fighting vehicle
AFWA,Air Force Weather Agency,Association of Fish and Wildlife Agencies,AG[edit]
AG,air gunner,Aktiengesellschaft (German,"incorporated"),Algeria (FIPS 10-4 country code),Antigua and Barbuda (ISO 3166 digram),Assemblies of God
ag,Attogram
Ag,Silver (Latin argentum)
AGA- AB Gas-accumulator ("ah-gah",Swedish company),Advanced Graphics Architecture
AGARD,Advisory Group for Aerospace Research and Development
AGARDograph,Advanced Guidance for Alliance Research and Development publication
AGASA,Akeno Giant Air Shower Array (cosmic ray detector)
AGB,Internal Nintendo initialism (Advanced Game Boy) for Game Boy Advance
AGC,Adjutant General's Corps (British Army)
AGC,Apollo Guidance Computer,Automatic Gain Control
AGDC,Australian Game Developers' Conference
AGI,Auxiliary Group Intelligence
AGL,Above Ground Level
AGM,Annual General Meeting
AGN,Active Galactic Nucleus
AGO,Angola (ISO 3166 trigram)
AGP,Accelerated Graphics Port
AGRICOLA,Agriculture Online Access
AGS,Alaska Ground Station (LandSat)
AGTS,Advanced Gunnery Training System
AGU,American Geophysical Union
AGW,Autonomous Guided Weapon
Ah,Ampere-hour
AH,Attack Helicopter
aH,Attohenry
AHA,American Heart Association
AHCPR,Agency for Health Care Policy and Research (obsolete; replaced with AHRQ)
AHEC,Australian Health Ethics Committee
AHPCRC,Army High Performance Computing Research Center
AHQ,Air Headquarters
AHRQ,Agency for Healthcare Research and Quality
AHS,American Housing Survey
AI,Air Interdiction,Amnesty International,Artificial Insemination,Artificial Intelligence,Anguilla (ISO 3166 digram)
AIA,Aerospace Industries Association,American Institute of Architects,Anguilla (ISO 3166 trigram)
AIAA,American Institute of Aeronautics and Astronautics
AIC,African Independent Church,Animal Identification Coordinator
AICD,Australian Institute of Company Directors
AICMFP,And I Claim My Five Pounds
AID,U.S. Agency for International Development
AIDS,Acquired Immune Deficiency Syndrome
AIM,Australian Institute of Management
AIMP,Aurora Incremental Modernization Project
AIPAC,American Israel Public Affairs Committee
AIR,Aircraft Inventory Record
AIRFA,American Indian Religious Freedom Act
AIRS, Aerometric Information Retrieval System (obsolete; replaced with AFS)
AIS,Australian Institute of Sport,Automatic Identification System
AISB,(British Society for the Study of) Artificial Intelligence and the Simulation of Behaviour
aJ,Attojoule
AJ,Azerbaijan (FIPS 10-4 country code)
Ajax,Asynchronous JavaScript And XML
AJD,Astronomical Julian day
AJP,Allied Joint Publication
AJPW,All Japan Pro Wrestling
AK,Alaska (postal symbol)
aK,Attokelvin
AKA,Above knee amputation (orthopaedic usage)
AKDT,Alaska Standard Daylight Saving Time (UTC−8 hours)
AKP,Adalet ve Kalkınma Partisi (Turkish,"Justice and Development Party")
AKST,Alaska Standard Time (UTC−9 hours)
AL,Alabama (postal symbol),Albania (FIPS 10-4 country code; ISO 3166 digram),Anno Lucis (Latin,"Year of Light",in Masonic tradition,most often seen on plaques bearing the founding dates of buildings,in years AD and years AL)
Al,Aluminium
aL,Attolitre
ALA,Åland Islands (ISO 3166 trigram)
ALAP,As Long/Late As Possible
ALARM,Air-Launched Anti-Radar Missile
ALB,Albania (ISO 3166 trigram)
ALD,Accounting Line Designator (nuclear weapon targeting)
ALERT,Advanced Linked Extended Reconnaissance and Targeting,Attack and Launch Early Reporting to Theatre
ALF,Africa Leadership Forum,Alien Life Form (cf. ALF (TV series)),Animal Liberation Front
ALG,Algeria (IOC and FIFA trigram,but not ISO 3166)
ALGOL,ALGOrithmic Language
ALOA,Associated Locksmiths of America,Inc.
ALOC,Air Lines Of Communication,Average Length of Calls
ALPA,Air Line Pilots Association
ALS,Amyotrophic Lateral Sclerosis,Automatic Landing System
ALSHS,Abraham Low Self-Help Systems
ALSP,Aggregate Level Simulation Protocol
ALTE,Association of Language Testers in Europe
Am,Americium
AM-many,including Amplitude Modulation and Ante Meridiem; see entry,Armenia (FIPS 10-4 country code; ISO 3166 digram)
AM1,Airman 1st class
AMA,American Medical Association,Australian Medical Association
AMAPS,Aircraft,Missile,Avionics Performance Simulation
AMC,Adaptive modulation and coding (digital communications),U.S. Air Mobility Command,American Motors Corporation,American Movie Classics (TV network; now known simply by the initials),U.S. Army Materiel Command
AMCB,U.S. Army/Marine Corps Board
AMFOM,Advanced Missile Fly Out Model ("am-fomm")
AMFR,Age-specific Marital Fertility Rate,Amplitude Modulation Following Response
AMFRS,Advanced Multi-Function Radio Frequency System,Automatic Multisensor Feature-based Recognition System
AML,Acute Myeloid Leukaemia
AMLCD,Active Matrix Liquid Crystal Display
AMLO,Andrés Manuel López Obrador (Mexican politician),Anti-Money Laundering Office (Thailand government agency)
AMO,Atlantic Multidecadal Oscillation
AMOLED,Active-matrix organic light-emitting diode
AMOS,Advanced MOrtar System,Air Force Maui Optical and Supercomputing observatory
AMP,Adenosine MonoPhosphate,Automated Mission Planner
AMRAAM,Advanced Medium-Range Air-to-Air Missile
AMRDEC,U.S. Aviation & Missile Research,Development,& Engineering Center
AMS,Agriculture Marketing Service,American Mathematical Society
AMSAA,U.S. Army Materiel Systems Analysis Activity
AMSO,U.S. Army Model and Simulation Office
AMSU,Advanced Microwave Sounding Unit
AMTE,UK Admiralty Marine Technology Establishment (1977-1984)
AN,Andorra (FIPS 10-4 country code),Netherlands Antilles (ISO 3166 digram)
aN,Attonewton
ANA,Administration for Native Americans,Afghan National Army,All Nippon Airways,Anti-Nuclear Anti-body,Australian National Airways,Australian Natives' Association
ANC,African National Congress
AND,Andorra (ISO 3166 trigram)
ANFO,Ammonium nitrate/fuel oil (explosive)
ANGLiCo,Air/Naval Gunfire Liaison Company
ANL,Argonne National Laboratory
ANM,Acoustic Noise Monitor
ANOVA,ANalysis Of VAriance
ANS,Applied and Natural Sciences
ANSI,American National Standards Institute
ANT,Netherlands Antilles (ISO 3166 trigram),Antigua and Barbuda (IOC trigram,but not ISO 3166 or FIFA)
ANTM,America's Next Top Model
ANTY,Acronyms,No Thank You
ANWR,Arctic National Wildlife Refuge /ˈænwɑr/
ANZ,Australia and New Zealand Banking Group
ANZAC,Australian and New Zealand Army Corps
AO,Angola (FIPS 10-4 country code; ISO 3166 digram),Approach Officer (submarine),Area of Operations
AOC,Air Operations Centre,Air Officer Commanding
AOD,Adrenalin O.D. (punk rock band)
AOI,Angle Of Incidence  Arab Organization for Industrialization
AOL,America OnLine
AOR,Area of Responsibility
AOSTH,Adventures of Sonic the Hedgehog
AOTS,Attack of the Show!
AOU,American Ornithologists' Union
AP,"Advanced Placement,Air Publication,Andhra Pradesh (Indian state code),Armed Forces Pacific (postal symbol),Associated Press,Auto Pilot"
APB,All Points Bulletin (police jargon)
APC,Armoured Personnel Carrier,Armour Piercing Capped (ammunition)
APCNR,Armour-Piercing,Composite Non-Rigid (ammunition)
APCR,Armour-Piercing,Composite Rigid (ammunition)
APDS,Armour-Piercing,Discarding-Sabot (ammunition)
APEC,Asia Pacific Economic Cooperation
APEDS,AMSAA Performance Estimates Data System
APEX,Applied Physics Express
APFSDS,Armour-Piercing,Fin-Stabilised,Discarding Sabot (ammunition)
APHA,American Public Health Association
APHE,Armour-Piercing,High Explosive (ammunition)
APHIS,Animal and Plant Health Inspection Service
APL,"Acute Promyeloid Leukaemia,Anti-Personnel Landmine,Applied Physics Laboratory (Johns Hopkins University)"
APOD,Aerial Port (Airport) Of Debarkation
APOE,Aerial Port (Airport) Of Embarkation
APOLLO,Apache Point Observatory Lunar Laser-ranging Operation
APP,Allied Procedural Publication
APR,Annual Percentage Rate
APS,Advanced Photo System (cf. APS-C,an image sensor format based on the size of the original APS film frame),American Physical Society,Antiphospholipid Antibody Syndrome,AQ[edit]
AQ,AdventureQuest,American Samoa (FIPS 10-4 territory code),Antarctica (ISO 3166 digram),Automatic qualifier,a term used by U.S. sports media from 1998 to 2013 to refer to the six conferences whose champions automatically entered the now-defunct Bowl Championship Series of college football
AQIM,Al-Qaeda in the Islamic Maghreb
AR,Argentina (FIPS 10-4 country code; ISO 3166 digram),Arkansas (postal symbol),Armour,Arunachal Pradesh (Indian state code)
Ar,Argon
ARAG,Advanced Research and Assessment Group
ARB,Administrative Review Board
ARBA, Army Review Boards Agency
ARC,Arc-second Raster Chart,Appalachian Regional Commission
ARCA,Automobile Racing Club of America
ARCENT,United States Army Central Command
ARDA,Advanced Research and Development Activity (became DTO 2006)
ARE,UK Admiralty Research Establishment (-1991),United Arab Emirates (ISO 3166 trigram)
ARF,ASEAN Regional Forum
ARG,Argentina (ISO 3166 trigram)
ARH,Armed Reconnaissance Helicopter
ARI,Acute Respiratory Infection,U.S. Army Research Institute for the Behavioral and Social Sciences
ARL,UK Admiralty Research Laboratory (1921-1977),U.S. Army Research Laboratory,UIUC Aviation Research Laboratory
ARM,Anti-Radiation Missile,Adjustable-rate mortgage,Armenia (ISO 3166 trigram)
ARNet,Acquisition Reform Network
ARP,Applied Research Programme
ARPA,Advanced Research Projects Agency
ARRC,ACE Rapid Reaction Corps
ARRF,Allied Rapid Reaction Force
ARRL,American Radio Relay League
ARSC,Arctic Region Supercomputing Center
ARSPACE,U.S. Army Space Command
ART,Adaptive Resonance Theory,Anti-Retroviral Therapy
ARTCC,Air Route Traffic Control Center
ARWG,Army Research Working Group ("are-wig")
AS,ActionScript
AS,American Samoa (postal symbol; ISO 3166 digram),Australia (FIPS 10-4 country code),Assam / Asom (Indian state code)
As,Arsenic
aS,Attosiemens
ASA,AcetylSalicylic Acid,American Standards Association,Army Security Agency,Atlantic Southeast Airlines
ASAP,As Soon As Possible
ASARS,Advanced Synthetic Aperture Radar System,Airborne Search and Rescue System
ASB,Associated Student Body,Alternative Service Book (Church of England)
asbl,association sans but lucratif (French "Non-profit organisation")
ASBO,Anti-Social Behaviour Order
ASCAP,American Society of Composers,Authors,and Publishers
ASCC,Army Service Component Commander,Automatic Sequence Controlled Calculator,Air Standardization Coordinating Committee
ASCII,American Standard Code for Information Interchange
ASD,(U.S.) Assistant Secretary of Defense,autism spectrum disorder
ASDIC,Allied Submarine Detection Investigation Committee (Sonar)
ASEAN,Association of Southeast Asian Nations
ASFAR,Americans for a Society Free of Age Restrictions
ASG,Area Support Group
ASIC,Australian Securities and Investments Commission,Aviation Security Identification Card
ASICS,Anima sana in corpore sano (Latin,"A sound mind in a sound body") (athletic shoe manufacturer)
ASIO,Australian Security Intelligence Organisation,Audio stream input output
ASIP,Advanced System Improvement Program,Army Stationing and Installation Plan,Application-specific instruction-set processor
ASL,Above Sea Level,American Sign Language (also known as Ameslan),"Age,Sex,Location?" (Internet slang)
ASM,Air-to-Surface Missile,American Samoa (ISO 3166 trigram),American Society for Metals,American Society for Microbiology
ASMB,American Society for Matrix Biology,Adult Swim Message Board
ASME,American Society of Mechanical Engineers,American Society of Magazine ors
ASMP,Air-Sol Moyenne Portée missile (French "Medium-range air to surface"),Asymmetric multiprocessing
ASN,Associate of Science in Nursing
ASOC, Air Sovereignty Operations Centre,Air Support Operations Centre,Airport Security and Operations Centre,Antarctic and Southern Ocean Coalition,Atlanta Symphony Orchestra Chorus,Australian Standard Offence Classification
ASP,Active Server Pages,American Society of Primatologists,Ammunition Supply Point,Application Service Provider (cf internet service provider),Astronomical Society of the Pacific,Association of Surfing Professionals
ASPI,Australian Strategic Policy Institute
ASR,Alkali-silica reaction,Anti Slip Regulation
ASRAAM,Advanced Short-Range Air-to-Air Missile
ASSC,Association for the Scientific Study of Consciousness
AST,Atlantic Standard Time (UTC−4 hours)
ASTIA,Armed Services Technical Information Agency
ASTM,American Society for Testing and Materials
ASTREA,Aerial Support To Regional Enforcement Agencies (sheriff's air support unit)
ASUW,AntiSUrface Warfare
ASVAB,Armed Services Vocational Aptitude Battery(taken by juniors in high school in the USA)
ASVEL,Association Sportive Villeurbanne Éveil Lyonnais (Association Sportive is French for "Sporting Association"; the club was founded through the merger of AS Villeurbanne and Éveil Lyonnais)
ASW,AntiSubmarine Warfare
ASWORG,(U.S.) AntiSubmarine Warfare Operations Research Group
ASX,"Advanced Stream Redirector,Australian Securities Exchange"
AT,"Anti-Tank,Ashmore and Cartier Islands (FIPS 10-4 territory code),Austria (ISO 3166 digram),Advanced Technology (IBM Personal Computer/AT)"
At,Astatine
aT,Attotesla
ATA,"Advanced Technology Attachment (IBM Personal Computer),Afghan Transitional Authority,Allen Telescope Array,Antarctica (ISO 3166 trigram)"
ATAC,Air Transportable Acoustic Communications
ATACMS,Army TACtical Missile System
ATAPI,Advanced Technology Attachment Packet Interface
ATAS,Air-To-Air Stinger (missile)
ATAT,Aiken Tactical Airsoft Team / Star Wars vehicle
ATB,"Active Time Battle,British Antarctic Territory (ISO 3166 trigram; merged with AQ in 1979)"
ATC,"Air Training Corps, U.S. Air Transport Command (1942-1948), Athletic Trainer,Certified"
ATCCIS,Army Tactical Command and Control Information System
ATESS,Aerospace and Telecommunications Engineering Support Squadron
ATF,"French Southern Territories (ISO 3166 trigram),(U.S.) Bureau of Alcohol,Tobacco,Firearms and Explosives"
ATG,Antigua and Barbuda (ISO 3166 and FIFA trigram)
ATGM,Anti-Tank Guided Missile
ATGW,Anti-Tank Guided Weapon
ATI,Allied Telesyn International,Inc.,Array Technologies Incorporated. (ATI Technologies)
Atisbo,a Local Government Area in Nigeria named for constituent communities (Ago-Are,Tede,Irawo,Sabe,Baasi,Ofiki and Owo)
ATK,Attack
ATL,"Atlanta,Georgia,the largest city and capital of Georgia"
ATLAS,"All-Terrain Lifter Army System,Assessment Tool for LAnd Systems"
ATM,"Automated Teller Machine,Asynchronous Transfer Mode,At The Moment"
ATN,"Dronning Maud Land (ISO 3166 trigram; merged with AQ in 1983)"
ATO,"Air Tasking Order,Australian Taxation Office"
ATP,"Adenosine TriPhosphate,Allied Tactical Publication,Ammunition Transfer Point"
ATSD,(U.S.) Assistant Secretary of Defense
ATSDR,Agency for Toxic Substances and Disease Registry
ATV,All-Terrain Vehicle
ATWA,"Air,Trees,Water,Animals"
AU,"African Union (was OAU before 2000),American University,Astronomical Unit,Australia (ISO 3166 digram),Austria (FIPS 10-4 country code)"
Au,Gold (Latin Aurum)
AUC,"Ab Urbe Condita / Anno Urbis Conditae (Latin "from the founding of the city" / "in the year since the founding of the city") (of Rome),Area Under the Curve (concentration time curve; medicine)"
AUS,Australia (ISO 3166 trigram)
AUSCANNZUKUS,"Australia,Canada,New Zealand,United Kingdom,United States (security designation)"
Auslan,Australian Sign Language
AUT,Austria (ISO 3166 trigram)
AUTL,Army Universal Task List
AV,"Anguilla (FIPS 10-4 territory code),Audio-Visual,Aviation"
Av,Aperture value (photographic mode)
aV,Attovolt
AVA,American Viticultural Area
AVB,Audio Video Bridging
AVDLR,Aviation Depot Level Repair
AVGP,"Armoured Vehicle, General Purpose"
AVIM,Aviation Intermediate Maintenance
AVLB,Armoured Vehicle Launched Body
AVM,"Air Vice-Marshal, Arteriovenous malformation"
AVO,Apprehended Violence Order
AVP,Arubaanse Volkspartij
AVP,Association of Volleyball Professionals
AVRE,Armoured Vehicle Royal Engineers
AVTB,"Armoured Vehicle Test Bed,Aviation Test Bed"
AVUM,Aviation Unit Maintenance
AVVO,Acute Vaginal Venereal Outbreak
AW,Aruba (ISO 3166 digram)
aW,Attowatt
AWA,American Wrestling Association
AWC,Air Warfare Centre
AWD,All Wheel Drive
AWE,Advanced Warfighting Experiment
AWP,Awaiting Parts (SM&R code)
AWSIM,Air Warfare SIMulation
AWST,Australian Western Standard Time
AWW,Above Water Warfare
AX,Åland Islands (ISO 3166 digram)
AXP,Ambulance eXchange Point
AY,Antarctica (FIPS 10-4 territory code)
AYBABTU,All Your Base Are Belong To Us
AYU,As Yet Unknown
AZ,"Arizona (postal symbol),Azerbaijan (ISO 3166 digram),Alkmaar Zaanstreek (Dutch football club)"
AZE,Azerbaijan (ISO 3166 trigram)
AZUR,"Actions en zone urbaine (French for: Urban Operations)"
BAR,"Barbados (IOC trigram,but not FIFA or ISO 3166),British American Racing,Browning Automatic Rifle,Buy-American Restrictions,BARD , Binational Agricultural Research and Development fund (between the US and Israel),BARDA , Biomedical Advanced Research and Development Agency,BART , Bay Area Rapid Transit,BAS , Battalion Aid Station,BASE , Building,Antenna,Span,Earth (parachute from),BASF , Badische Anilin und Soda Fabrik (Baden Aniline and Soda Factory,a German chemicals company),BASIC , Beginner's All-purpose Symbolic Instruction Code (acronym was added later,originally it was simply Basic),BAT , Basic Aid Training,BATF , U.S. Bureau of Alcohol,Tobacco,and Firearms,BATS , Behavior Analysis Training System ,Bradley Advanced Training System,BATTeRS , Bisei Asteroid Tracking Telescope for Rapid Survey,BB[edit]"
BB,"Barbados (ISO 3166 digram; FIPS 10-4 country code),Boys' Brigade (Christian youth organization),Brigitte Bardot (actress),Bumblebee"
BBB,"Better Business Bureau,Blood-brain barrier"
BBC,"Breeding Bird Census,British Broadcasting Corporation,Bumper to Back of Cab (trucking measurement)"
BBL,"Be Back Later,Bird Banding Laboratory,British Basketball League"
BBN,"Bolt,Beranek and Newman"
BBQ,Barbecue
BBS,"Breeding Bird Survey (North America),Brigade/Battalion Battle Simulation,Bulletin Board System,BBSRC , U.K. Biotechnology and Biological Sciences Research Council,BBVA , Banco Bilbao Vizcaya Argentaria (Spanish bank)"
BBYO,"B'nai B'rith Youth Organization"
BC,"Before Christ,Blind Copy (in emailers),Boston College,Botswana (FIPS 10-4 country code; from Bechuanaland),British Columbia (postal symbol)"
BCA,"Bachelor of Computer Application,Black Coaches & Administrators"
BCC,Blind Carbon Copy
BCCI,"Bank of Credit and Commerce International,Board of Control for Cricket in India,BCD , Binary-Coded Decimal"
BEA,"Banque extérieure d'Algérie,British European Airways (ancestor of British Airways),British Electricity Authority,bel"
BEL,Belgium (ISO 3166 trigram)
BEN,Benin (ISO 3166 trigram)
BEO,Banquet Event Order
BERC,Business Environmental Resource Center
BER,Bit Error Rate
BH,"Bahrain (ISO 3166 digram),Belize (FIPS 10-4 country code)"
BHR,Bahrain (ISO 3166 trigram)
BNF,"Backus-Naur Form (computing), British National Formulary"
BNICE,"Biological,Nuclear,Incendiary,Chemical,and Explosive Agents"
BNP,"British National Party,Banque Nationale de Paris,a predecessor to today's BNP Paribas"
BNS,Bank of Nova Scotia
BNSF,Burlington Northern Santa Fe (also AAR reporting mark)
BO,"Back Orifice,Belarus (FIPS 10-4 country code),Biarritz Olympique (French rugby union club),Bolivia (ISO 3166 digram),Body odor"
BOAC,British Overseas Airways Corporation (predecessor of British Airways)
BoAML,Bank of America Merrill Lynch
BOC,"British Orthodontic Society, British Oxygen Company"
BÖC,Blue Öyster Cult
BODMAS,"Brackets,Orders,Division,Multiplication,Addition,Subtraction"
BOFH,Bastard Operator From Hell
BOGA,Bend Over and Grab Ankles
BOGOF,"Buy One,Get One Free"
BOGs,Bunch of Guys
BOI,"Balance Of Investment,Basis Of Issue"
BOL,Bolivia (ISO 3166 trigram)
BOM,"Base Object Model,Bill Of Materials,Block of the Month quilting term,Business opportunity meeting"
BOP,Balance of Payments,
BOPB,Biarritz Olympique Pays Basque (the complete name of the rugby club),
BOPD,Barrel of Oil Per Day
BOS,Battlefield Operating System
BOT,"Balance of Trade,Botswana (IOC and FIFA trigram,but not ISO 3166),Build Operate Transfer,Bank of Thailand,BP[edit]"
BP,"Battle Position,British Petroleum (today,BP does not officially stand for anything),Solomon Islands (FIPS 10-4 country code; from British Protectorate of the Solomon Islands),Bp , Bishop,BPD , Bipolar Personality Disorder,BPM , Beats Per Minute,BPMo , Business Process Mobility"
BPV,"Battlefield Planning Visualization,Bovine papillomavirus"
BQ,"British Antarctic Territory (former ISO 3166 digram; merged with AQ in 1979),Caribbean Netherlands (current ISO 3166 digram; based on the entity's alternate name of Bonaire,Sint Eustatius and Saba),Navassa Island (FIPS 10-4 territory code)"
BR,"Brazil (ISO 3166 digram; FIPS 10-4 country code) ,Bihar (Indian state code),British Rail,Break Ranks (marching band term)"
BRA,Brazil (ISO 3166 trigram)
BRAG,Bicycle Ride Across Georgia
BRASS,"Breathe,Relax,Aim,Sight,Squeeze (acronym for using a rifle)"
BS,The Bahamas (ISO 3166 digram),Bassas da India (FIPS 10-4 territory code),Bachelor of Science degree,British subject
BSA,"Birmingham Small Arms (motorcycles company),Boy Scouts of America,Brigade Support Area"
BSatCoP,Benjamin Sniddlegrass and the Cauldron of Penguins
BSE,"Bovine Spongiform Encephalopathy (better known as mad cow disease)"
BSN,Baloncesto Superior Nacional (Spanish,"National Superior Basketball"; top Puerto Rican league),Bank Simpanan Nasional (Malay,"National Savings Bank"; government-owned Malaysian bank)
BSNL,Bharat Sanchar Nigam Limited,Bachelor of Science in Nursing
BSoD,Blue Screen of Death (distinct from BSD)
BSP,"Between-Show Promotion,Binary Space Partitioning,Board Support Package,British Standard Pipe (screw thread),Business-sponsored,Bone sialoprotein"
BST,"Binary search tree,Blended Sales Tax,Bovine somatotropin,British Summer Time"
BSW,British Standard Whitworth (screw thread)
BSX,Bendigo Stock Exchange
BT,Baal teshuva (Hebrew,"master of repentance") ,used to describe a Jew who adopts Orthodox Judaism as an adult,Bathythermograph,Bhutan (FIPS 10-4 country code; ISO 3166 digram),BitTorrent,British Telecom,the former name of the company now known as BT Group,BTDT , Been There,Done That,Bti , Bacillus thuringiensis israelensis,BTID , Battlefield Target Identification Device,BTIS , Battlefield Target Identification System
Bt,Baronet,Bacillus thuringiensis
BTO,Built To Order
BTP,British Transport Police
BTR,Bronetransporter (БТР = Бронетранспортер "(Heavy) Armoured (Personnel) Transporter") †[2]
BTU,British Thermal Unit
BTW,By The Way
BU,Bulgaria (FIPS 10-4 country code) -,Burma (ISO 3166 digram; obsolete since 1989)
BUAV, British Union for the Abolition of Vivisection
BUG-E,Battlefield Universal Gateway Equipment ("buggy"),
BUNO,Bureau Number (aircraft serial number)
BUR,Burma (ISO 3166 trigram; obsolete since 1989)
BV,"Background Vocals -,Battlefield Visualization ,,Bouvet Island (ISO 3166 digram; FIPS 10-4 territory code)"
BVD,"Bradley,Voorhees & Day (underwear manufacturer)"
BVR,Beyond Visual Range,
BVT,Bouvet Island (ISO 3166 trigram),
B&W,"Babcock & Wilcox, Black and White, Bowers & Wilkins"
BW,Bring Wedges (ISO digram)
BW,Botswana (ISO 3166 digram)
BWA,Botswana (ISO 3166 trigram)
BWARS,"Bees,Wasps & Ants Recording Society"
BWC,Biological and Toxin Weapons Convention
BWR,Boiling-Water Reactor
BX,Base eXchange
BY,Burundi (FIPS 10-4 country code) -,Belarus (ISO 3166 digram)
BYOB,"Bring Your Own Bottle (or beer, beverage, or booze) (multiple,but similar,meanings)"
BYOC,Bring Your Own Computer (play on BYOB)
BYOF,Bring Your Own Flask
BYS,Byelorussian Soviet Socialist Republic (ISO 3166 trigram; obsolete since 1992)
BYU,Brigham Young University
BZ,Belize (ISO 3166 digram)
BZP,Benzylpiperazine
C,"Carbon, Coulomb, One Hundred (in Roman numerals)"
c,Centi
C2C,"Consumer-To-Consumer electronic commerce, Cam-To-Cam internet chat"
c2c,the British rail company formerly known as LTS Rail
Ca,Calcium
CA,"California (postal symbol),Canada (FIPS 10-4 country code; ISO 3166 digram),Catalonia,Civil Affairs,Close Armour,Cocaine Anonymous,Computer Associates,Counter-Air,Cricket Australia"
CAA,"Canadian Automobile Association,(NORAD) Center for Aerospace Analysis,(U.S.) Center for Army Analysis,(U.S.) Clean Air Act,(U.S. Army) Concepts Analysis Agency,Civil Aviation Authority,Colonial Athletic Association"
CAAT,"Campaign Against Arms Trade,Center for Alternatives to Animal Testing"
CAC,"California Association of Criminalists,Chronic Asymptomatic [Disease] Carrier"
CACM,Central American Common Market
CACM,Communications of the ACM
CADCAM,"Computer-Aided Design/Computer-Aided Manufacturing"
CADMID,"Concept,Assessment,Demonstration,Manufacture,In service,Disposal (life cycle mnemonic)"
CADPAT,CAnadian Disruptive PATtern
CAE,"Canadian Aviation Electronics (originally),Certificate in Advanced English"
CAEn,Close Action Engagement (constructive simulation)
CAF,"Central African Republic (ISO 3166 trigram),Confederation of African Football (or French Confédération Africaine de Football)"
CAFAD,Combined Arms For Air Defence
CAFDE,"Canadian Association of Film Distributors and Exporters,Computer Aided Federation Development Environment"
CAFE,Corporate Average Fuel Economy standard
CAI,Computer Assisted Instruction
CAIR,Council on American-Islamic Relations
CALABARZON,"A region in the Philippines: CAvite,LAguna,BAtangas,Rizal,queZON"
CALL,Center for Army Lessons Learned
CALM,"Communications,Air-interface,Long and Medium range"
CalPERS,California Public Employees' Retirement System
Caltrans,California Department of Transpotation
CAM,"Chemical Agent Monitor,Complementary and alternative medicine,Computer-Aided Manufacturing,Crassulacean acid metabolism (type of photosynthesis)"
CAMRA,CAMpaign for Real Ale
CAN,Canada (ISO 3166 trigram)
CANA,Convulsive Antidote,Nerve Agent
CANDU,CANada Deuterium Uranium (nuclear reactor design)
Canola,"Canadian oil,low acid (referring to a specific cultivar of rapeseed bred to have a low erucic acid content)"
CAPES,"CAPability Evaluation System,Combined Arms Planning and Execution System"
CARE,"Citizens Association for Racial Equality (former New Zealand organisation),Community database on Accidents on the Roads in Europe,Cooperative for Aid and Relief Everywhere (originally Cooperative for American Remittances to Europe)"
CARMONETTE,Computerized Monte Carlo Simulation
CARP,Computed Air Release Point
CART,Championship Auto Racing Teams (now defunct)
CAS,"Chemical Abstracts Service,Chief of the Air Staff,Close Air Support"
CASA,Civil Aviation Safety Authority
CASE,"Cellular ammunition storage equipment,Computer-Aided Software Engineering"
CASS,Command Activated Sonobuoy System
CASTFOREM,Combined Arms and Support Task FORce Evaluation Model
CASTOR,Canadian Automatic Small Telescopes for Orbital Research
CAT,"Community Acceptance Testing,Computer-Assisted (or Axial) Tomography"
CATK,Counterattack
CATS,Computer Active Technology Suspension
CATT,Combined Arms Tactical Trainer
CAV,Cavalry
CAVOK,Ceiling And Visibility OK ("Kav-okay")
CAW,Canadian Auto Workers (trade union)
CB,"Citizens' Band radio,Cambodia (FIPS 10-4 country code)"
CBASSE,Commission on Behavioral And Social Sciences and Education ("sea bass")
CBC,"Canadian Broadcasting Corporation,Christmas Bird Count,Cipher-Block Chaining,Cornering Brake Control"
CBE,"Commander of the Order of the British Empire,Cab Beside Engine (see truck)"
CBF,Confederação Brasileira de Futebol (Portuguese,"Brazilian Football Confederation")
CBGB,"Country,Blue Grass,and Blues (former New York City nightclub)"
CBLA,Comparative bullet lead analysis
CBM,Canadian Baptist Ministries
CBM,Commodore Business Machines
CBML,Coalition Battle Management Language
CBN,CardsApp Brand Number
CBOL,Consortium for the Barcode of Life
CBOT,Chicago Board of Trade
CBR,Case-Based Reasoning
CBRN,"Chemical,Biological,Radiological,or Nuclear (weapon or event)"
CBRNE,"Chemical,Biological,Radiological,Nuclear or [high-yield] Explosive (weapon or event)"
CBS,"Columbia Broadcasting System,Corps Battle Simulation"
CBUS,"Columbus,Ohio"
CC,carbon copy
CCA,Counter Command Activity
CCC,"Canterbury Clothing Company,Civilian Conservation Corps (U.S.,1930s and 1940s),Corpus Christi College,Oxford"
CCCP,"Central Committee of the Communist Party,Cyrillic for SSSR (Soyuz Sovetskikh Sotsialisticheskikh Respublik,Russian Союз Советских Социалистических Республик,Union of Soviet Socialist Republics)"
CCD,"Charge-Coupled Device,Confraternity of Christian Doctrine (Catechism)"
CCF,Cartoon Cartoon Fridays
CCG,"Canadian Coast Guard,Collectible Card Game"
CCGC,"Canadian Coast Guard Cutter,Canadian Coast Guard College"
CCGH,Canadian Coast Guard Hovercraft
CCGS,"Canadian Coast Guard Ship,Christ Church Grammar School"
CCH,Computer-Controlled Hostile
CCIF,"Comité consultatif international des communications téléphoniques à grande distance (French for International Telephone Consultative Committee,merged with the CCIT in 1956 to form the CCITT)"
CCII,"Command and Control Information Infrastructure,Community Capital Investment Initiative"
CCIR,"Comité consultatif international pour la radio (French for Consultative Committee on International Radio,became the ITU Radiocommunication Sector,ITU-R,in 1992),Commander's Critical Information Requirements"
CCIT,"Comité consultatif international télégraphique (French for International Telegraph Consultative Committee,merged with the CCIF in 1956 to form the CCITT)"
CCITT,"Comité consultatif international téléphonique et télégraphique (French for International Telegraph and Telephone Consultative Committee,became the ITU Telecommunication Standardization Sector,ITU-T,in 1992)"
CCK,"Cholecystokinin,Cocos (Keeling) Islands (ISO 3166 trigram)"
CCM,"Canada Cycle & Motor Co. Ltd. (now split into two separate companies bearing the CCM name,one manufacturing bicycles and the other ice hockey equipment),Contemporary Christian music"
CCOC,"Canadian Children's Opera Chorus,Crosley Car Owners Club"
CCOP,Coalition Common Operating/Operational Picture
CCP,"Casualty Collection Point,Communications Checkpoint,Contingency Communications Package"
CCPA,Consumer Credit Protection Act
CCR,Creedence Clearwater Revival
CCRAp,Canadian Conservative Reform Alliance party
CCRP,Command and Control Research Program
CCRTS,Command and Control Research and Technology Symposium
CCSCS,Consultative Committee for Space Data Systems
CCSCS,Coordinadora de Centrales Sindicales del Cono Sur
CCSIL,Command and Control Simulation Interface Language ("cecil")
CCSK,Cyclic Code Shift Keying
CCT,Current Commitments Team
Cd,Cadmium
cd,Candela
CD,Compact Disc
CD1,Cluster of Differentiation 1 (a small gene family)
CDA,UK Centre for Defence Analysis
CDC,Control Data Corporation,Cult of the Dead Cow
CDD,Capabilities Development Document
CDE,Chemical Defence Equipment
CDIAC,Carbon Dioxide Information Analysis Center ("see-dee-ack")
CDipAF,Certified Diploma in Accounting and Finance
CDL,Commercial driver's license
CDM,"Clean Development Mechanism (Kyoto protocol), Cold Dark Matter (astronomy)"
CDMA,Code Division Multiple Access
CDMSII,Cryogenic Dark Matter Search II
Cdr,Commander
CDS,Chief of the Defence Staff,Credit default swap
CDT,Central Daylight Time (UTC−5 hours)
Cdt,Commandant
Ce,Cerium
CE,Christian/Common Era
CEA,Campaign Effectiveness Analysis
CECOM,U.S. Army Communications and Electronics Command
CEDEX,Courrier d'entreprise à distribution exceptionnelle (French,"Company Mail with Exceptional Distribution"; "exceptional" refers to the volume of mail)
CEGEP,Collège d'enseignement général et professionnel (French,"College of General and Vocational Education")
CEI,Competitive Enterprise Institute
CENTCOM,United States Central Command
CENTO,Central Treaty Organization (Baghdad Pact)
CENZUB,Centre d'entraînement aux actions en zone urbaine (French,"Urban Operations Training Centre")
CEO,Chief Executive Officer
CEP,Circular Error Probable
CEPT,Conférence européenne des administrations des postes et des télécommunications (French,"European Conference of Postal and Telecommunications Administrations")
CERCLA,"U.S. Comprehensive Environmental Response,Compensation,and Liability Act (Superfund)"
CERDEC,"U.S. Communications-Electronics Research,Development and Engineering Center"
CERGA,Centre de recherches en géodynamique et astrométrie (French,"Astrometry and Geodynamics Research Centre")
CERN,Centre européen pour la recherche nucléaire (French,"European Organization for Nuclear Research")
CERT,Computer Emergency Response Team
CESS,Centre for Earth Science Studies (India)
CEST,Central European Summer Time
CET,Central European Time
CEWC,Council for Education in World Citizenship
Cf,Californium
CF,"Canadian Forces,Central African Republic (ISO 3166 digram),Republic of the Congo (FIPS 10-4 country code)"
CFA,"Cat Fanciers' Association,Chartered Financial Analyst,Colour Filtering Array,County Fire Authority,Covering Force Area"
CFAR,"Christine's,Federal Acquisition Regulation"
CFC,"ChloroFluoroCarbon,Canadian Fish Company"
CFES,Continuous Flow Electrophoresis System
CFFZ,Call For Fire Zone
CFG,"Context-free grammar,Control flow graph"
CFHT,Canada-France-Hawaii Telescope
CFI,Center for Inquiry (CSICOP)
CFL,"Canadian Football League,Co-ordinated Fire Line"
CFLCC,Coalition Forces Land Component Command
CFM,Certified Facilities Manager
CFO,Chief Financial Officer
CFP,"Call for papers, College Football Playoff, Common Fisheries Policy (EU)"
CFR,Code of Federal Regulations,Căile Ferate Române (Romanian,"Romanian Railways")
CFRP,Carbon fibre reinforced plastic
CFS,Chronic Fatigue Syndrome
CFSP,Common Foreign and Security Policy
CFU,Colony Forming Unit in Microbiology
CFV,Cavalry Fighting Vehicle
CFZ,Critical Friendly Zone
CG,"Client Group,Computer Graphics,Controls Group,Democratic Republic of the Congo (FIPS 10-4 country code),Republic of the Congo (ISO 3166 digram)"
CGH,Comparative Genomic Hybridisation
CGIG,Cross-Government Implementation Group
CGO,"Republic of the Congo (IOC and FIFA trigram,but not ISO 3166)"
CGS,Chief of the General Staff
CGT,Capital Gains Tax
ch,ch(L) is used to denote the Chern character of a line bundle
CH,"Chieftain tank,China (FIPS 10-4 country code),Switzerland (ISO 3166 digram; from Latin Confoederatio Helvetica)"
CHAMPUS,(U.S.) Civilian Health and Medical Program of the Uniformed Services (now known as TRICARE)
CHAOS,Cambridge Heart Anti-Oxidant Study
CHAPS,Clearing House Automated Payment System
CHDK,Canon Hack Development Kit (Canon camera firmware hack)
CHE,"Switzerland (ISO 3166 trigram; from Latin Confoederatio Helvetica)"
CHI,"Columbia Helicopters,Inc"
CHiP,California Highway Patrol
CHIPS,Cosmic Hot Interstellar Plasma Spectrometer
CHL,Chile (ISO 3166 trigram)
CHLA,Core Historical Literature of Agriculture
CHN,China (ISO 3166 trigram)
CHOGM,Commonwealth Heads of Government Meeting
CHP,California Highway Patrol,Combined Heat and Power
CHPSO,California Hospital Patient Safety Organization
CHRS,Canadian Heart Rhythm Society
CHT,Certified Hand Therapist
CI,"Chile (FIPS 10-4 country code),Côte d'Ivoire (ISO 3166 digram),Counter-Intelligence,101 (in Roman numerals)"
Ci,Curie
CIA,"Cairo International Airport,Central Intelligence Agency,Culinary Institute of America"
CIAO,"Critical Infrastructure Assurance Office,Component-Integrated ACE ORB"
CIB,Complete In Box (Internet auction/trading listings)
CIBC,Canadian Imperial Bank of Commerce
CICS,Customer Information Control System (IBM mainframe software; "kicks" or "C-I-C-S")
CID,Certified Interior Designer
CIEF,Comité international d'enregistrement des fréquences (International Frequency Registration Board)
CIF,Cost,Insurance,and Freight (Paid) (shipping)
CIMMYT,Centro Internacional de Mejoramiento de Maíz Y Trigo (Spanish,"International Maize and Wheat Improvement Center")
CINC,Commander in Chief
CINEOS,Campo Imperatore Near-Earth Object Survey
CIO,Chief information officer,Congress of Industrial Organizations
CIPE,(European) Centre for International Political Economy
CIR,(Commander's) Critical Information Requirements
CIR,Corotating Interaction Region
CIS,"Canadian Interuniversity Sport,Commonwealth of Independent States,Command and Information System,Communication and Information System"
CISA,(U.S.) C4I Integration Support Activity
CISB,Complete In Sealed Box (Internet auction/trading listings)
CISPR,Comité international spécial des perturbations radioélectriques (Special International Committee on Radio Interference)
CISSP,Certified Information Systems Security Professional
CITES,Convention on International Trade in Endangered Species (of Wild Fauna and Flora) ("sigh-tease")
CIV,Côte d'Ivoire (ISO 3166 trigram)
CIVETS,Colombia,Indonesia,Vietnam,Egypt,Turkey,South Africa (economics)
CIVPOP,Civilian Population
CIWS,Close-In Weapon System
CJ,"Cayman Islands (FIPS 10-4 country code),Criminal Justice"
CJC,"Canadian Jewish Congress,Cold Junction Compensation"
CJCS,Chairman of the Joint Chiefs of Staff
CJD,"Chronological Julian Day,Creutzfeldt-Jakob Disease"
CJO,Chief of Joint Operations
CJTF,Combined Joint Task Force
CK,"Cocos (Keeling) Islands (FIPS 10-4 country code),Cook Islands (ISO 3166 digram)"
CKA,"commonly known as, Canada Kicks Ass"
CKND,Codename: Kids Next Door
CL,"Chile (ISO 3166 digram),Co-ordination Line,One Hundred and Fifty (in Roman numerals)"
Cl,Chlorine
CLA,Clutterers Anonymous
CLEC,Competitive Local Exchange Carrier
CLEMARS,California Law Enforcement Mutual Aid Radio System
CLIC,Compact LInear Collider
CLO,Cornell Lab of Ornithology
CLOS,Command to Line-Of-Sight (missile control system)
CLPFC,CentroLateral PreFrontal Cortex
CLRP,College Loan Repayment Program
CM,"Cameroon (FIPS 10-4 country code; ISO 3166 digram),Cruise Missile,Nine Hundred (in Roman numerals)"
Cm,Curium
CMA,"U.S. Chemical Materials Agency,Country Music Association (also used to refer to the organization's annual awards),Crystal Meth Anonymous"
CMHC,Canada Mortgage and Housing Corporation
CMIIAW,Correct me if I am wrong
CMIS,Common management information service
CMJ,Christopher Martin-Jenkins (BBC sports commentator)
CML,Chemical,Chronic Myelogenous Leukemia (formerly Chronic Myeloid Leukemia)
CMLL,Consejo Mundial de Lucha Libre (Spanish,"Worldwide Wrestling Council"—Mexican professional wrestling promotion)
CMM,Capability Maturity Model
CMMC,Corps Materiel Management Centre
CMML,"Chronic MyeloMonocytic Leukemia,Continuous Media Markup Language"
CMOS,"Canadian Meteorological and Oceanographic Society,(The) Chicago Manual of Style,Complementary Metal Oxide Semiconductor"
CMP,Common [Operating/Operational] Maritime Picture
CMPD,Charlotte Mecklenburg Police Department
CMPD,Chronic Myeloproliferative Disease
CMR,"Cameroon (ISO 3166 trigram),Coaxial Main Rotors (helicopter type)"
CMS,"Centers for Medicare and Medicaid Services,The Chicago Manual of Style"
CMT,Country Music Television
CMU,"Carnegie Mellon University,Central Michigan University,Concrete Masonry Unit"
CMW,"Marconi's Wireless Telegraph Company of Canada,Canadian Manufacturing Week,Canadian Music Week,Catherine McAuley Westmead (school in New South Wales,Australia),Chicago,Missouri and Western (Railway),Compartmented Mode Workstation,Compton's Most Wanted,Continuous Microwave (processing technology),Custom Maintenance Wizard (Microsoft Office Resource Kit)"
CMYK,Cyan Magenta Yellow Key/blacK (colour model)
CN,"Canadian National (railway; also the AAR reporting mark for said company),China (ISO 3166 digram),Comoros (FIPS 10-4 country code)"
CNA,"Center for Naval Analyses,Certified Network Administrator,Computer Network Attack,Continental (Casualty Company),National (Fire Insurance Company),and American (Casualty Company),the three companies that merged to form what is now known as CNA Financial"
CNBC,Consumer News and Business Channel
CND,"Campaign for Nuclear Disarmament,Computer Network Defence"
CNE,"Canadian National Exhibition,Computer Network Exploitation,Certified Network Engineer"
CNF,Cost and Freight
CNI,Clinical Nursing Intern
CNI,"Communications,Navigation and Identification"
CNN,"Cable News Network,Cellular Nonlinear Network"
CNV,Copy-Number Variable (genetics)
Co,Cobalt
COB,Close Of Business [day]
COBRA,Consolidated Omnibus Budget Reconciliation Act of 1985
COD,"Cash On Delivery,Democratic Republic of the Congo (ISO 3166 trigram)"
CoDA,Co-Dependents Anonymous
COGENT,Cognitive Objects within a Graphical EnviroNmenT
COIL,Chemical Oxygen Iodine Laser
COK,Cook Islands (ISO 3166 trigram)
COL,Colombia (ISO 3166 trigram)
COLA,Cost Of Living Adjustment
COM,Comoros (ISO 3166 trigram),Component Object Model
COMECON,Council for Mutual Economic Assistance (economic counterpart of the Warsaw Pact,1949-1991)
CONAD,U.S. Continental Air Defense Command
CONCACAF,Confederation Of North,Central American and Caribbean Association Football
CONMEBOL,Confederación Sudamericana de Fútbol or Confederação Sul-Americana de Futebol (respectively Spanish and Portuguese for "South American Football Confederation")
CONUS,Continental United States
COO,Chief Operating Officer
COPE,U.K. Committee On Publication Ethics
COPUS,U.K. Committee on the Public Understanding of Science
CORD,Common Operational Requirements Document
CORE,Consortium for Oceanographic Research and Education
COROT,COnvection,ROtation and planetary Transits
COS,Cooper Ornithological Society
COSER,COoperative SERvice
CoT,Car of Tomorrow (former NASCAR race car design)
COTS,Commercial Off The Shelf
CP,"Canadian Pacific,Check Point,Command Post,Club Penguin"
CPA,Certified Public Accountant
CPAC,Conservative Political Action Conference,Cable Public Affairs Channel ("see-pack")
CPCU,Certified Property Casualty Underwriter
CPD,Capabilities Production Document
CPE,Certificate of Proficiency in English
CPE,Certified Professional Ergonomist
CPF,"Calibration Parameter File,Canadian Patrol Frigate"
CPG,Clinical Practice Guideline
CPI,CERDEC Command,Power and Integration
CPIM,Certification on Production and Inventory Management
CPIR,Computationally-Private Information Retrieval
CPON,Certified Pediatric Oncology Nurse
CPPCC,Chinese People's Political Consultative Conference
CPR,Canadian Pacific Railway
CPR,Cardiopulmonary resuscitation
CPSM,Continuous Phase Shift Modulation
CPSU,Communist Party of the Soviet Union
CPT,Contingency Planning Team
CPU,Contract Postal Unit
CPV,Cape Verde (ISO 3166 trigram)
CPX,Command Post eXercise
CQ,"Carrier Qualification,Central Queensland,Charge of Quarters,Congressional Quarterly,Constellation Airlines (IATA airline designator),Northern Mariana Islands (FIPS 10-4 territory code)"
CQD,Close Quarters Drill (Morse distress code preceding SOS: CQ "calling all stations",D "Distress"; often incorrectly interpreted as "Come Quick,Distress")
Cr,Chromium
CR,"Coral Sea Islands (FIPS 10-4 territory code),Costa Rica (ISO 3166 digram)"
CRAM,Combined Radiometric Correction Model
CRD,Capstone Requirements Document
CREB,Cyclic AMP-response Element Binding (protein)
CREEP,"Committee for the Re-Election of the President,a pejorative nickname used by opponents"
CREN,Christian Real Estate Network Real Estate Association
CRI,"China Radio International,Costa Rica (ISO 3166 trigram)"
CRIPL,Consolidated Remain-In-Place List
CRM,"Cardiac Rhythm Management,Customer Relationship Management"
CRO,"Croatia (IOC and FIFA trigram,but not ISO 3166)"
CRP,"Committee for the Re-Election of the President,Control and Reporting Post"
CRT,"Cardiac Resynchronization Therapy,Cathode Ray Tube,Chinese Remainder Theorem"
CRTC,Canadian Radio-television and Telecommunications Commission
Cs,Caesium
CSA,"Canadian Soccer Association,Canadian Space Agency,Canadian Standards Association,Child Support Agency,Command Staff Advisor,Community-supported agriculture,Confederate States of America,Corps Storage Area,Czech Airlines,C/S/A,CINC,Service,and Agency"
CSC,"Closed Spacelike Curve (relativity),Compact system camera,Computer Sciences Corporation,Computer Security Centre,CSCC Canadian Society of Clinical Chemists"
CSERIAC,(U.S. DoD) Crew Systems Ergonomics Information Analysis Center
CSG,Corps Support Group
CSI,see entry
CSICOP,Committee for the Scientific Investigation of Claims of the Paranormal (became the Committee for Skeptical Inquiry in 2006)
CSIP,Commercial Stable Image Platform (AMD)
CSIS,"Canadian Security Intelligence Service ("seessiss"),(U.S.) Center for Strategic & International Studies"
CSK,Czechoslovakia (ISO 3166 trigram; obsolete since 1993)
CSL,U.K. Central Science Laboratory
CSPI,Center for Science in the Public Interest
CSR,Control Supply Rate
CSR,Corporate Social Responsibility
CSRC,Conflict Studies Research Centre
CSRF,Cross-Site Request Forgery
CST,Central Standard Time (UTC−6 hours)
CT,"Computed tomography (medical scan also known as a CAT scan),Central Time zone,Chrono Trigger (Computer/Video games),Connecticut (postal symbol),Canterbury (postal symbol),Chhattisgarh (Indian state code)"
CTA,Central African Republic (FIFA trigram,but not ISO 3166 or IOC),Chicago Transit Authority,Comando-Geral de Tecnologia Aerospacial (Portuguese,[Brazilian] "General Command for Aerospace Technology")
CTBT,Comprehensive [Nuclear] Test Ban Treaty
CTDB,Compact Terrain Data Base (file format)
CTE,Canton and Enderbury Islands (ISO 3166 trigram; obsolete 1984),Chronic traumatic encephalopathy
CTGF,connective tissue growth factor
CTI,Co-operative Target Identification
CTIL,Critical Tracked Items List
CTIS,Central Tire Inflation System
CTMS,Clinical Trial Management System
CTO,Chief Technical Officer,Chief Technology Officer
CTS,Clear-To-Send,Collective Training Standards,Communications Technology Service,Contract Technical Services,Conversation Time Sharing,COSMIC Top Secret
CTSS,Compatible Time-Sharing System
CTU,Counter Terrorist Unit (fictional branch of the Central Intelligence Agency in the television action series 24)
CTVT,Canine Transmissible Venereal Tumour
CU,Carrie Underwood,Cuba (FIPS 10-4 country code; ISO 3166 digram)
Cu,Copper (Latin Cuprum)
CUB,Cuba (ISO 3166 trigram)
CUCV,Commercial Utility Cargo Vehicle
CUNY,City University of New York ("CUE-knee")
CUPE,Canadian Union of Public Employees ("CUE-pee")
CUPS,Common Unix Printing System
CUPW,Canadian Union of Postal Workers
CUREA,Consortium for Undergraduate Research and Education in Astronomy
CuW,Copper-tungsten pseudo-alloy (from the chemical symbols of the two component elements)
CUW,Curaçao (ISO 3166 trigram)
CV,curriculum vitae (résumé)
CVLL,Crypto Variable Logic Label
CVSD,Continuous Variable Slope Delta (modulation)
CVT,Continuously Variable Transmission
CW,"Calendar Week, or: Continuous Wave, or: Clothes Washer, or: Cook Islands (FIPS 10-4 territory code)"
CWC,Chemical Weapons Convention
CWRU,Case Western Reserve University
CWS,Canadian Wildlife Service
CX,"Christmas Island (ISO 3166 digram),or: One Hundred and Ten (in Roman numerals)"
CXR,Christmas Island (ISO 3166 trigram)
CY,"Calendar year, or: Cyprus (ISO 3166 and FIPS 10-4 country code digram)"
CYM,Cayman Islands (ISO 3166 trigram)
CZE,Czech Republic (ISO 3166 trigram)
CZF,(Christian Zombie Fan)
CZMA,(US) Coastal Zone Management Act
d,Deci
D,Deuterium
DA,Denmark (FIPS 10-4 country code),Debtors Anonymous,U.S. Department of the Army,District Attorney
DADVSI,Loi sur le droit d’auteur et les droits voisins dans la société de l’information (French,"Law on copyrights and related rights in the information society")
DAES,Defence Acquisition Executive Summary,(UK MoD) Directorate of Analysis,Experimentation and Simulation
DAF,Dissolved Air Flotation,a technique used in water treatment
DAFIF,Digital Aeronautical Flight Information File
DAK,Disney's Animal Kingdom
DAO,Division Ammunition Officer
DAQ,Data acquisition,Delivered Audio Quality
DARE,Drug Abuse Resistance Education
DARO,(U.S.) Defense Airborne Reconnaissance Office
DARPA,U.S. Defense Advanced Research Projects Agency
DART,Disaster Assistance Response Team,Dublin Area Rapid Transit
DAS,Defensive Aids Suite
DASD,(U.S.) Deputy Assistant Secretary of Defense
DASL,Datapoint's Advanced Systems Language
DAU,(U.S.) Defense Acquisition University
DAWN,(U.S.) Drug Abuse Warning Network
dB,Decibel
DB,Deutsche Bahn
Db,Dubnium
DBA,De Bellis Antiquitatis (miniature wargaming rules)
DBBL,(U.S. Army Simulation Center) Dismounted Battlespace Battle Laboratory
DBDO,Desert BDO
DBE,Dame Commander of the Order of the British Empire
DBF,Detection By Fire (weapon launch signature)
DBR,De Bellis Renationis (miniature wargaming rules)
DBRA,Davis-Bacon Related Acts
DBS,Direct Broadcast Services (television)
DC,da capo,Italian Democrazia Cristiana,Digital Compass,Direct Current,District of Columbia (postal symbol),Douglas Aircraft Company,Dublin Core,Duty Cycle
DCA,Defensive Counter Air,Drum Corps Associates,DiChloroAcetate
DCAA,(U.S.) Defense Contract Audit Agency
DCAS,Devon and Cornwall Archery Society
DCC,Dallas Christian College
DCD,[Organ] Donation after Cardiac Death
DCE,Data Communication Equipment
DCFC,Death Cab for Cutie
DCI,Detection,Classification and Identification,Drum Corps International,Duellists' Convocation International,now known simply by the initials
DCL,Disney Cruise Line
DCN,Deacon
DCOM,Disney Channel Original Movie
DCSOPS,Deputy Chief of Staff for Operations and plans
DCW,Digital Chart of the World
DCYSC,Discovery Channel Young Scientist Challenge
DD,"due diligence and dear daughter (increasingly prevalent on social mailing lists,blogs,and bulletin boards)"
DDA,Deputy District Attorney
DDN,U.S. Defense Data Network
DDP,Danish Design Prize,Deutsche Demokratische Partei (German,"German Democratic Party",former political party in Weimar Germany),Diamond Dallas Page (American professional wrestler)
DDR,Dance Dance Revolution,Deutsche Demokratische Republik (German,"German Democratic Republic" (GDR),East Germany),Double Data Rate,East Germany (ISO 3166 trigram,obsolete since 1990),DDR&E,(U.S.) Defense Department Research and Engineering
DDS,Doctor of Dental Surgery
DDT,Dichloro-Diphenyl-Trichloroethane (insecticide),Dynamic Debugging Tool (computing),DE[edit]
DE,Delaware (postal symbol),Germany (ISO 3166 digram)
DEA,Drug Enforcement Administration
DEA,Drug Enforcement Agency
DEC, Department of Environmental Conservation,Digital Equipment Corporation,Disasters Emergency Committee
DeCA,(U.S.) Defense Commissary Agency
DEFCON,Defence readiness condition
DEFRA,(UK) Department for Environment,Food and Rural Affairs
DELT,Dual Ended Line Test (ing)
DEM,Data Exchange Mechanism,Digital Elevation Model
DEN,Denmark (IOC and FIFA trigram,but not ISO 3166)
DEPSECDEF,(U.S.) Deputy Secretary of Defense
DERA,British Defence Evaluation and Research Agency (1995-2001)
DES,Deep Ecliptic Survey
DEU,Germany (ISO 3166 trigram)
DF,Direct Fire,Direction Finding,Distrito Federal (Spanish and Portuguese for "federal district")
DFAD,Digital Feature Analysis Data ("dee-fad")
DFAS,(U.S.) Defense Finance and Accounting Service
DFB,Deutscher Fußball-Bund (German for "German Football Association")
DFCB,Data Format Control Book
DfID,UK Department for International Development
DFL,Democratic-Farmer-Labor (the full designation of the Minnesota affiliate of the U.S. Democratic Party),Deutsche Fußball Liga (German for "German Football League"),the operator of the top two leagues of German football
DFM,Discrete Field Model see Superluminal motion
DFM,Dynamic Flowgraph Methodology
DFSP,Dermatofibrosarcoma protuberans
DfT,UK Department for Transport
DFTBA,Don't Forget To Be Awesome,a term commonly used by the Vlogbrothers
DG,Dei gratia (Latin,"by the grace of God"),Director-General,Data General
DGA,Direction générale des armées (French "Armed Forces General Directorate")
DGPS,Differential GPS
DGZ,Desired Ground Zero
DH,dear husband (increasingly prevalent on social mailing lists,blogs,and bulletin boards),Designated hitter
DHA,DocosaHexaenoic Acid
DHHS,(U.S.) Department of Health and Human Services
DHL,Dalsey,Hillblom,and Lynn (courier service)
DHRA,(U.S.) DoD Human Resources Activity
DHS,U.S. Department of Homeland Security
DHSS,UK Department of Health and Social Security
DHTFYSS,U.S. Don't Have Time For You Silly S****
DHY,Dahomey (ISO 3166 trigram; became BEN for Benin in 1977)
DIA,U.S. Defense Intelligence Agency
DIAC,Department of Immigration and Citizenship (Australia) [1]
DiC,Design Island Centre (computing usually used in a teaching situation)
DICASS,DIrectional Command Activated Sonobuoy System
DIFAR,DIrectional Frequency Analysis and Recording
DIME,Dense Inert Metal Explosive
DIN,Deutsches Institut für Normung (German,"German Institute for Standardization"),Drug Identification Number (Canadian drug marketing requirement)
DINA-(p/a) Diesel Nacional (Spanish,"National Diesel"—Mexican bus and truck manufacturer now known as DINA),Dirección de Inteligencia Nacional (Spanish,"National Intelligence Directorate"—former secret police of Chile)
DINKY,Double Income,No Kids Yet
DIP,Dual In-line Package (electronics)
DIPS,Defense independent pitching statistics
DIR,Defence Industrial Research
DIS,Defence Intelligence Staff,(U.S.) Defense Investigative Service,Distributed Interactive Simulation,Draft International Standard (ISO)
DISA,U.S. Defense Information Systems Agency,Distinguished Individual Service Award
DISCOM,Division Support Command
DISE,Deployable Intelligence Support Element
DISSTAF,DIS Search and Target Acquisition Fidelity experiment
DITY,Do-It-Yourself
DIVAD,Division Air Defence
DIY,Do It Yourself
DJ,Disc Jockey,Dinner Jacket,Djibouti (ISO 3166 digram; FIPS 10-4 country code)
DJD,Degenerative Joint Disease,Dublin Julian Day,Discoveries in the Judaean Desert
DJI,Djibouti (ISO 3166 trigram)
DJS,Director,Joint Staff
DK,Denmark (ISO 3166 digram)
DL,Dexter's Laboratory
DLA,U.S. Defense Logistics Agency,Dental Laboratories Association
DLIC,Detachment Left-In-Contact
DLIR,Depot-Level Inspection and Repair
DLPMC,DorsoLateral PreMotor Cortex
DLR,Deutsches Zentrum für Luft,und Raumfahrt (German,German Aerospace Centre),Docklands Light Railway
DLRP,Data Link Reference Point
DLS,Deep Lens Survey
DLSA,(U.S.) Defense Legal Services Agency
DLSc,Diploma in Library Science
DLSC,U.S. Defense Logistics Services Center,U.S. Defense Logistics Support Command,Department of Library Special Collections (Western Kentucky University Libraries),Direct Loan Servicing Center,Directorate of Land Strategic Concepts (Canada),Dominican Lay Scholars Community
DLTBGYD,Don't let the bastards grind you down
DM,Dominica (ISO 3166 digram),Dungeon Master (role-playing games)
DMA,Designated market area (primarily a U.S. term),U.S. Defense Mapping Agency (became NIMA,then NGA),Direct Memory Access (computing),Dominica (ISO 3166 trigram)
DMC,(U.S.) Defense Management Council
DMCA,Digital Millennium Copyright Act
DMD,dentariae medicinae doctor (Latin,"doctor of dental medicine"),Digital Micromirror Device,Digital Multilayer Disk
DMM,Digital Multimeter
DMOC,Distributed Mission Operations Centre
DMPA,(U.S.) Defense Medical Programs Activity
DMPFC,DorsoMedial PreFrontal Cortex
DMPK,Drug Metabolism and Pharmacokinetics
DMRB,Design Manual for Roads and Bridges
DMS,U.S. Defense Message System
DMSO,Dimethyl sulfoxide,U.S. Defense Modeling & Simulation Office ("dim-so"),now Modeling and Simulation Coordination Office
DMSP,U.S. Defense Meteorological Satellite Program
DMT,Dimethyltryptamine
DMU,Diesel Multiple Unit,a method of connecting self-propelled railway vehicles together to form a train under the control of one driver.
DMV,Department of Motor Vehicles
DMZ,DeMilitarized Zone
DN,Deacon
DNA,U.S. Defense Nuclear Agency,DeoxyriboNucleic Acid,Douglas Noël Adams
DNAW,Day Night All Weather
DND,Department of National Defence (Canada),Do Not Disturb
DNDi,Drugs for Neglected Diseases initiative
DNDO,U.S. Domestic Nuclear Detection Office
DNK,Denmark (ISO 3166 trigram)
DNM,Defence Nuclear Material
DNR,Do Not Resuscitate
DNS,Domain Name System
DO,Dominica (FIPS 10-4 country code),Dominican Republic (ISO 3166 digram),Doctor of Osteopathic Medicine
DOA,Dead On Arrival,Dead or Alive
DOB,Date Of Birth
DOD,U.S. Department of Defense
DODAF,U.S. Department of Defense Architectural Framework
DoDD,U.S. Department of Defense Directive
DoDEA,(U.S.) Department of Defense Education Activity
DOE,U.S. Department of Energy
DOHC,Dual-OverHead-Cam engine
DOI,U.S. Department of the Interior
DOM,Deo optimo maximo (Latin,"to God,the best and greatest"),Document Object Model,Dominican Republic (ISO 3166 trigram)
DORA,Defence of the Realm Act
DOS,Density of State
DOT,Department of Transportation (U.S. federal or state),Damage Over Time (common in World of Warcraft)
DOTA,short-form for DEFENSE OF THE ANCIENTS a popular online epic game
DotD,Deal of the Day (marketing gimmick)
DOTMLPF,Doctrine,Organization,Training,Materiel,Leadership,Personnel,and Facilities (mnemonic)
DOW,Died of Wounds
DP,Decision Point,Dynamic Programming
DP,Division de production (Algerian petroleum company)
DPA,UK Defence Procurement Agency
DPCO,Double-Pole Change Over
DPDT,Double-Pole Double-Throw
DPI,Dots Per Inch
DPICM,Dual-Purpose Improved Conventional Munition
DPKO,UN Department for Peacekeeping Operations
DPMO,(U.S.) Defense Prisoner of War/Missing Personnel Office
DPPDB,Digital Point Positioning Database
DPRE,Displaced Person or Refugee (plural Displaced Persons and Refugees) (originally Displaced Persons,Refugees,Evacuees)
DPRK,Democratic People's Republic of Korea
DPST,Double-Pole Single-Throw
DQ,Dairy Queen,Jarvis Island (FIPS 10-4 country code)
DR,Dead Reckoning,Dominican Republic (FIPS 10-4 country code),Danmarks Radio (Danish Broadcasting Corporation)
DRA,Defence Research Agency (UK,1991-1995),Democratic Republic of America
DRAGN,Double Radio source Active Galactic Nucleus ("dragon")
DRC,Democratic Republic of the Congo
DRDC,Defence Research & Development Canada
DREA,Defence Research Establishment Atlantic (obsolete 2002)
DRES,Defence Research Establishment Suffield (obsolete 2002)
DRET,Defence Research Establishment Toronto (obsolete 2002)
DREV,Defence Research Establishment Valcartier (obsolete 2002)
DRI,Detection,Recognition,Identification,Dietary Reference Intake
DRIC,(U.S.) Defense Research Information Center
DRL,Daytime Running Lights,Dorman Roberts Ltd.
DRMS,(U.S.) Defense Revitalization and Marketing Service
DRPR,Drawing Practices
DRT,Document Related Technologies
Ds,Darmstadtium
DS,Dear son (increasingly prevalent on social mailing lists,blogs,and bulletin boards),Defence Scientist,Direct Support,Dust Storm (METAR Code)
DSA,(U.S.) Defense Support Activities,Division Support Area
DSAA,(U.S.) Defense Security Assistance Agency,Driving Schools Association of the Americas,DECT Standard Authentication Algorithm
DSAS,Disney Sing Along Songs
DSB,(U.S.) Defense Science Board
DSC,Differential Scanning Calorimeter,Digital Selective Calling,Digital Still Camera,Distinguished Service Cross,Doctor of Surgical Chiropody (obsolete),Document structure convention (PostScript programming),Dynamic Stability Control
DSCS,U.S. Defense Satellite Communications System
DSCSOC,DSCS Operations Center
DSD,Defence Studies Department (King's College,London)
DSDS,Deutschland sucht den Superstar (German,"Germany Seeks the Superstar"),the German version of the Idol series
DSE,Dry Sheep Equivalent
DSG,Direct-Shift Gearbox
DSID,Dismounted Soldier Identification System
DSL,Digital Subscriber Line
DSLR,Digital single-lens reflex (camera)
DSM,Diagnostic and Statistical Manual of Mental Disorders
DSN,Deep Space Network
dsp,decessit sine prole (Latin,"died without issue"),genealogy short-hand
DSP,Defense Standardization Program,Defense Support Program,
dspl,decessit sine prole legitima (Latin,"died without legitimate issue")
DSPL,Design Specialists and Plans Language
dspm,decessit sine prole mascula [superstite] (Latin,"died without surviving male issue" )
dspml,decessit sine prole mascula legitima (Latin,"died without legitimate male issue")
dspms,decessit sine prole mascula superstite (Latin,"died without surviving male issue")
dsps,Decessit sine prole superstite (Latin,"died without surviving issue")
DSR,Deformed Special Relativity
DSRV,Deaf Sports Recreation Victoria,Deep Submergence Rescue Vehicle
DSS,Digitized Sky Survey,Discarding-Sabot Shell (ammunition)
DST,Daylight Saving Time
DSTL,British Defence Science and Technology Laboratory
dsvp,d.s.v.p. decessit sine vitae patria (Latin,"died within fathers lifetime")
DSWA,(U.S.) Defense Special Weapons Agency
DTA,Dental Technologists Association
DTD,Digital Terrain Data
DTE,Data Terminal Equipment,Down To Earth
DTED,Digital Terrain Elevation Data ("dee-ted")
DTG,Date-Time Group
DTH,Direct To Home (television)
DTI,UK Department of Trade and Industry
DTIC,(U.S.) Defense Technical Information Center
DTL,Diode-Transistor Logic (electronics)
DTLOMS,Doctrine,Training,Leader development,Organization,Materiel,and Soldier (mnemonic)
DTM,Deutsche Tourenwagen Masters (German,"German Touring Car Masters",a current motor racing series),Deutsche Tourenwagen Meisterschaft (German,"German Touring Car Championship",a defunct motor racing series)
DTMF,Dual-tone multi-frequency signaling
DTO,Disruptive Technology Office (was ARDA)
DTOMLS,Doctrine,Training,Organization,Materiel,Leader and Soldier development (mnemonic)
DTR,Determine The Relationship
DTRA,Defense Threat Reduction Agency ("deet-ra")
DTSA,(U.S.) Defense Technology Security Administration
DU,Depleted Uranium,Dust (METAR Code)
DUI,Data Use Identifier,Data Use Institute,Davis Unified Ignition,Diving Unlimited International,Documento Único de Identidad,Documento Unico de Importación,Driving Under the Influence,Duke University Improv
DUMBO,Down Under the Manhattan Bridge Overpass (Brooklyn neighborhood)
DUSD,(U.S.) Deputy Under-Secretary of Defense
DV,Daily Value (FDA food guide),Deo volente (Latin,"God willing")
DVLC,UK Driver and Vehicle Licencing Centre
dvm,decessit vita matris (Latin,"died in the lifetime of the mother")
DVM,Doctor of Veterinary Medicine
DVO,Direct View Optics
DVOM,Digital Volt-Ohm Meter
dvp,decessit vita patris (Latin,"died in the lifetime of the father")
DVP,various meanings (disambiguation page)
dvu,decessit vita uxoris (Latin,"died in the lifetime of spouse")
DW,Drum Workshop
DWI,Dance With Intensity,Danish West Indies,Diffusion-weighted imaging,Direct water injection,Disaster Welfare Inquiry,Drinking Water Inspectorate,Driving While Intoxicated/Impaired
DWIM,Do What I Mean
DWM,Doctor Who Magazine
DWTS,Dancing with the Stars
DWW,Down with Webster
DX,Dexterity (role-playing games),DeXtrorphan,Distant (radio),D-Generation X (professional wrestling stable)
DXA,Dual-energy X-ray Absorptiometry
DXM,DeXtroMethorphan
DY,Dahomey (ISO 3166 digram; obsolete since 1977)
Dy,Dysprosium
DZ,Algeria (ISO 3166 digram),Drizzle (METAR Code),Drop Zone
DZA,Algeria (ISO 3166 trigram)
E,East
EA,Electronic Attack,Emotions Anonymous,Engagement Area,Electronic Arts,Enrolled Agent,Environmental Assessment,Enterprise Architect,Exaampere
EABU,Explain Acronyms Before Use
EAC,Echelons Above Corps
EAFUS,"Everything" Added to Food in the United States (FDA list)
EAPC,Euro-Atlantic Partnership Council
EAST,Experimental Advanced Superconducting Tokamak
EBD,Electronic Brake Distribution
EBE,Extraterrestrial Biological Entity
EBO,Effects Based Operations,Encyclopædia Britannica Online,European Board of Ophthalmology
EBSA,Employee Benefits Security Administration
EBW,Electron Beam Welding
EBW,Exploding BridgeWire
ECASS,European Centre for Analysis in the Social Sciences [1]
ECB,England (and Wales) Cricket Board,European Central Bank
ECBR,European Coalition for Biomedical Research
ECCM,Electronic Counter-Counter-Measures
ECFS,Electronic Case Filing System
ECG,Electrocardiogram
ECHO,Each Community Helps Others (EPA programme),Educational Concerns for Hunger Organization,European Commission Host Organization,European Commission Humanitarian aid Office,Exchange Clearing House,Expanded Characteristic Option,Explanatory Coherence by Harmony Optimization
ECHR,European Convention on Human Rights
ECJ,European Court of Justice
ECL,Emitter Coupled Logic (electronics)
ECM,Electronic Counter-Measures,Enterprise Content Management
ECommHR,European Commission on Human Rights
ECS,Emergency Contact System,Enhanced Chip Set (computing),EOSDIS Core System,Extended Chip Set (computing)
ECSC,European Coal and Steel Community (distant ancestor of the EU)
ECT,ElectroConvulsive Therapy
ECtHR,European Court of Human Rights
ECU,Ecuador (ISO 3166 trigram),European Currency Unit (ancestor of the euro)
ECW,Eastern Championship Wrestling/Extreme Championship Wrestling,ED[edit]
EDA,European Defence Agency
EDAC,Error Detection And Correction
EDCS,Environmental Data Coding Specification
EDD,Earliest due date,Electron-detachment dissociation,Elena Delle Donne (American basketball player),Employment Development Department (California state agency),End-diastolic dimension,Expected Date of Delivery (pregnancy)
EDGAR,Electronic Data Gathering,Analysis,and Retrieval (U.S. Securities and Exchange Commission filings database)
EDH,Eastman Dental Hospital
EDS,Electronic Data Systems,Electronic Differential System
EDSA,Epifanio de los Santos Avenue (a major thoroughfare in Manila with great significance to post-1980 Philippines history)
EDT,Eastern Daylight Saving Time (UTC−4 hours)
EDTA,Electric Drive Transportation Association,EthyleneDiamineTetraAcetic acid,EE[edit]
EE,Estonia (ISO 3166 digram; from the country's native name of Eesti),Electrical engineering,Electrical Engineer,E&E,Escape and Evasion (training)
EEC,European Economic Community (predecessor of the EU)
EEG,ElectroEncephaloGram
EENT,End Evening Nautical Twilight
EEO,Equal Employment Opportunity
EEOC,(U.S.) Equal Employment Opportunity Commission
EEZ,Economic Exclusion Zone or Exclusive Economic Zone
EF,Electro-focus (Canon lens mount),Entry Foyer,Exafarad
EFF,Electronic Frontier Foundation
EFL,English as a Foreign Language
EFM,Enterprise Feedback Management
EFOA,European Fuel Oxygenates Association
EFSA,European Food Safety Authority
EFT,Electronic Fund Transfer
EFTA,European Free Trade Area,European Free Trade Association
EFV,Expeditionary Fighting Vehicle
EG,Egypt (ISO 3166 digram; FIPS 10-4 country code)
EGBUS,External Genitalia,Bartholin's glands,Urethra & Skene's glands
EGCG,EpiGalloCatechin-3-Gallate
EGIS,Erieye Ground Interface Segment
EGRET,Energetic Gamma-Ray Experiment Telescope
EGY,Egypt (ISO 3166 trigram)
EH,Exahenry,Western Sahara (ISO 3166 digram)
EHA,Education for All Handicapped Children Act (U.S. federal legislation; since superseded by the Individuals with Disabilities Education Act),Emotional Health Anonymous
EHF,Extremely High Frequency
EHR,Equipment History Record
Ei,Exbi
EI,Ireland (FIPS 10-4 country code; from Éire)
EIA,Environmental Impact Assessment
EIAH,Encyclopedia of Iranian Architectural History
EIAH,Environnements Informatiques pour l'Apprentissage Humain
EIC,East India Company
EICS,East India Company's Service
eID,electronic ID
EIRP,Effective Isotropic Radiated Power
EIS,Environmental Impact Statement
EJ,Exajoule
EK,Equatorial Guinea (FIPS 10-4 country code),Exakelvin
EKG,Electrocardiogram (from German Elektrokardiogramm)
EKMS,Electronic Key Management System
EL,Exalitre
ELF- Earth Liberation Front,Endangered Language Fund,Eritrean Liberation Front,Executable and Linkable Format,Extremely Low Frequency
ELINT,Electronic Intelligence
ELL,English Language Learner
ELM,Edge-Localised Mode (plasma physics)
ELO,Electric Light Orchestra
ELP,Emerson,Lake & Palmer,European Left Party
ELSS,Emergency Life Support Stores
ELT,Emergency Locator Transmitter
EM,ElectroMagnetism/ElectroMagnetic
Em,Exametre
EMA,European Medicines Agency
Embraer,Empresa Brasileira de Aeronáutica (Portuguese,"Brazilian Aeronautics Company")
EMC,Electric Membership Corporation,Electromagnetic Compatibility,Electro-Motive Corporation,European Muon Collaboration,Evergreen Marine Corporation
EMCON,(Electromagnetic) Emissions Control
EMD,General Motors Electro-Motive Division,Engineering and Manufacturing Development,European Missile Defence
EMDG,Euro-Missile Dynamics Group
EMDR,Eye Movement Desensitisation and Reprocessing
EMEA,"Europe,Middle East and Africa"
EMF,Electromotive force,Epsom Mad Funkers (1990s-2000s indie dance band)
EMG,ElectroMyoGraph
EMO,Emergency Measures Organisation, Emotional
EMP,ElectroMagnetic Pulse
EMS,Emergency Medical Services
EMT,Emergency Medical Technician
EMU,Electric Multiple Unit,a method of connecting self-propelled railway vehicles together to form a train under the control of one driver.
EN,Corps of Engineers,Estonia (FIPS 10-4 country code),Exanewton
ENCODE,Encyclopedia of DNA Elements (human genome data project)
ENE,East North-East
ENG,England (FIFA trigram; not eligible for an ISO 3166 or IOC trigram)
ENSATT,École nationale supérieure des arts et techniques de théâtre (French,"Higher National School of Theatrical Arts and Techniques")
ENT,Ear,Nose and Throat
ENTEC,Euro NATO Training Engineer Centre
ENVL,Envelope
ENY,Enemy
EO,Electro-Optics,Engagement Operations
EOD,Explosive Ordnance Disposal
EOG,ElectroOculoGraphy
EOM,End of Message
EOS,Earth Observation Satellite, Electro-Optical System,Canon's autofocusing system for film and digital SLR cameras,Electrophoresis Operations in Space,a space manufacturing project of the McDonnell Douglas Astronautics Company
EOSAT,Earth Observation Satellite
EOSDIS, Earth Observation Satellite Data and Information System
EOTS,Electro-Optical Tactical Sensor, Eye Of The Storm (World of Warcraft)
EP,European Parliament
EP,Extended play
EPA,EicosaPentaenoic Acid,Environmental Protection Agency
EPCOT,Experimental Prototype Community Of Tomorrow
EPCR,Endothelial protein C receptor,European Professional Club Rugby
EPFL,École polytechnique fédérale de Lausanne (French,"Lausanne Federal Institute of Technology")
EPGS,EOS Polar Ground Sites
EPIRB, Emergency Position Indicating Radio Beacon
EPL,English Premier League
EPLRS,Enhanced Position Location Reporting System ("ee-plarz")
EPO,Ellinikí Podosferikí Omospondía (Greek Ελληνική Ποδοσφαιρική Ομοσπονδία,translated as "Hellenic Football Federation"),European Patent Organisation or its main organ,the European Patent Office,Erythropoietin
EPOS,Electronic Point Of Sale
EPPA,Employee Polygraph Protection Act
EPR,European Pressurised [Nuclear] Reactor
EPW,Earth Penetrator Weapon/Warhead,Economic and Political Weekly (Indian publication),Enemy Prisoner of War,EQ[edit]
EQ,Emotional Quotient
EQG,Equatorial Guinea (FIFA trigram,but not IOC or ISO 3166)
ER,Emergency Room,Eritrea (ISO 3166 digram; FIPS 10-4 country code)
Er,Erbium
ERA,Earned run average,Engineering Research Associates,Equal Rights Amendment,English Racing Automobiles,European Railway Agency
ERCIM, European Research Consortium for Informatics and Mathematics
ERI,Eritrea (ISO 3166 trigram)
ERLAWS,Eastern Ruapehu Lahar Alarm and Warning System
EROS,Earth Resources Observation System
ERP,Engineer Regulating Point
ERR,Eesti Rahvusringhääling
ERS,Earth Resources Survey
ERTS,Earth Resources Technology Satellite (became Landsat)
ERV,Endogenous RetroVirus
Es,Einsteinium,Exasecond
ES,El Salvador (FIPS 10-4 country code),Electronic warfare Support,Exasiemens,Spain (ISO 3166 digram; from the country's native name of España)
ESA,Electro-Spark Alloying,Endangered Species Act,European Space Agency
ESC,Embryonic Stem Cell,Electronic Stability Control
ESD,ElectroStatic Discharge
ESDP,European Security and Defence Policy
ESE,East South-East
ESH,Western Sahara (ISO 3166 trigram)
ESL,English as a Second Language
ESM,Electronic warfare Support Measures
ESO,European Southern Observatory
ESOL,English for Speakers of Other Languages
ESP,Electronic Stability Program,Extra-sensory perception,Spain (ISO 3166 trigram)
ESPGHAN,European Society for Paediatric Gastroenterology,Hepatology and Nutrition
ESPN,Entertainment and Sports Programming Network
EST,Eastern Standard Time (UTC−5 hours),Estonia (ISO 3166 trigram)
ESU,Emergency Services Unit
ESV,Engineer Support Vehicle
ET,Ethiopia (ISO 3166 digram; FIPS 10-4 country code)
ETA,Estimated Time of Arrival,Euzkadi Ta Azkatasuna ("etta",Basque,"Basque Homeland and Freedom"),et al.,et alii/aliae/alia (Latin,"and others")
ETF,Emergency Task Force (a special police unit,also jocularly said to stand for Extra-Thick Fuzz)
ETH,Ethiopia (ISO 3166 trigram)
ETI,Extra-Terrestrial Intelligence
ETLA,Extended TLA
ETM,Electronic Technical Manual,Enhanced Thematic Mapper
ETT,Embedded Training Team
EU,Europa Island (FIPS 10-4 country code),European Union
Eu,Europium
EUCOM,(U.S.) European Command
EUUSA,European Union and United States of America
EV,Exavolt
EVA,Earned Value Analysis,Economic value added,Ethylene-Vinyl Acetate,Extra-Vehicular Activity
EVIL,Electronic viewfinder (with) interchangeable lens (a type of digital camera)
EW,Electronic Warfare,Exawatt
EWSD,Elektronisches Wählsystem Digital (German,"Electronic Digital Switching System")
EWTN,Eternal Word Television Network
Exatesla,Extra Terrestrial
EXREP,Expeditious Repair (SM&R code)
EYD-Ejaan Yang Disempurnakan (Indonesian,"Perfected Spelling System",used officially in Indonesia since 1972),Eurovision Young Dancers,EZ[edit]
EZ,Czech Republic (FIPS 10-4 country code),Extraction Zone
EZLN,Ejército Zapatista de Liberación Nacional (Spanish,"Zapatista Army of National Liberation")
F,Farad,Fluorine
f,Femto
fA,Femtoampere
FA,Field Artillery,Financial Aid,Football Association (England)
FA,Food Addicts in Recovery Anonymous
FAA,"Financial Aid Administrator,Fleet Air Arm,Functional Area Analysis"
FAAD,Forward Area Air Defence
FAADEZ,Forward Area Air Defence Engagement Zone
FAAFP,Fellow of the American Academy of Family Physicians
FAAN,Fellow of the American Academy of Neurology
FAAN,Fellow of the American Academy of Nursing
FAAQ,Frequently Asked and Anticipated Questions
FAASV,Field Artillery Ammunition Supply Vehicle
FAB,Feline Advisory Bureau (UK feline charity)
FAC,Forward Air Controller,Front of Allies for Change,Frontal Affinity Chromatography,Full Aperture Calibrator
FACA,(US) Federal Advisory Committee Act
FACH,Fuerza Aérea de Chile
FACN,Fellow of the American College of Nutrition
FACP,Fellow of the American College of Physicians
FACS,Fellow of the American College of Surgeons,Formal Aspects of Computing Science,Fluorescent-activated cell sorting
FACTS,Flexible Alternating Current Transmission System
FAD,Flavin Adenine Dinucleotide,Fuck A Duck,Funding Authorization Document
FAH,Federation of American Hospitals,Fine Arts and Humanities,Foreign Affairs Handbook
FAI,Fédération Aéronautique Internationale (French,"International Aeronautics Federation"),Football Association of Ireland
FAM,Foreign Affairs Manual
FAO,Food and Agriculture Organization
FAPA,Fellow of the American Psychological Association
FAPHA,Fellow of the American Public Health Association
FAQ,Frequently Asked Questions (sometimes pronounced "fak")
FARC,Fuerzas Armadas Revolucionarias de Colombia (Spanish,"Revolutionary Armed Forces of Colombia")
FARP,Forward Arming and Refuelling Point / Forward Area Rearm/refuel Point
FAS,Federation of American Scientists,Fetal Alcohol Syndrome
FASCAM,Family of Scatterable Mines[1]
FASD,Fetal Alcohol Spectrum Disorder
FASEB,Federation of American Societies for Experimental Biology
FAT,Field Artillery Tractor
FAVS,Future Armoured Vehicle System
FAW,Football Association of Wales
FB,Facebook,An on-line social network
FBCS,Fellow of the British Computer Society
FBIDST,Fellow of the British Institute of Dental and Surgical Technologists
FBIS,Foreign Broadcast Information Service
FBM,Board foot
FBR,Fast Breeder Reactor,Foundation for Biomedical Research,Friedman,Billings,Ramsey (now known as Arlington Asset Investment)
FBS-Federal Bureau of Statistics (Pakistan),Fetal bovine serum,Football Bowl Subdivision (U.S. college football),Fukuoka Broadcasting Corporation,FC[edit]
fC,Femtocoulomb
FC,Fire Control,Football Club,Funnel Cloud (METAR Code)
FCC,U.S. Federal Communications Commission
FCE,First Certificate in English
FCF,Financial Free Cash Flow
FCLA,Fraud Claims Law Associate
FCM,Federation of Canadian Municipalities,Fogarty's Cove Music
FCO,UK Foreign and Commonwealth Office
FCW,Florida Championship Wrestling
FD,Falun Dafa
FDA,Food and Drug Administration (U.S.)
FDBK,(I) Feedback
FDC,Federal Detention Center (U.S.),Fire Direction Centre
FDR,Flight Data Recorder,Franklin Delano Roosevelt
FE,Fully Exposed (armoured vehicle target,as opposed to Hull-Down)
Fe,Iron (Latin Ferrum)
FEAR,First Encounter Assault Recon,False Evidence Appears Real
FEAST,Forum for European-Australian Science and Technology Cooperation
FEATS,Festival of European Anglophone Theatrical Societies link title
FEB,Federación Española de Baloncesto (Spanish,"Spanish Basketball Federation"),Federatie Eredivisie Basketball (Dutch,"Federation Honorary Division (of) Basketball"),the former name of the basketball competition now known in Dutch by the English-language Dutch Basketball League,Força Expedicionária Brasileira (Portuguese,"Brazilian Expeditionary Force")
FEBA,Forward Edge of the Battle Area
FED,Field Emission Display
FEDEP,Federation Development Process (Simulation)
FEF,Frontal Eye Field (neurophysiology)
FEI,Fédération équestre internationale (French,"International Federation for Equestrian Sports")
FEMA,"Farm Equipment Manufacturers Association, U.S. Federal Emergency Management Agency,Fire Equipment Manufacturers' Association"
FEMEXFUT,Federación Mexicana de Fútbol Asociación (Spanish,"Mexican Association Football Federation")
FENAFUTH,Federación Nacional Autónoma de Fútbol de Honduras (Spanish,"National Autonomous Football Federation of Honduras")
FENS,Federation of European Neuroscience Societies
FEP,Firepower Enhancement Program,Fleet satellite (FLTSAT) Extremely high frequency (EHF) Package
FEPAFUT,Federación Panameña de Fútbol (Spanish,"Panamanian Football Federation")
FES,Flywheel Energy Storage
FEST,Frankfurt English Speaking Theatre link title
FET,Field-effect transistor
FEZ,Fighter Engagement Zone
fF,Femtofarad
FF,Final Fantasy
FFA,Football Federation Australia,Pacific Islands Forum Fisheries Agency,Free-Fire Area,Fusiform Face Area,Future Farmers of America (today the National FFA Organization)
FFB,Frum From Birth (referring to an observant Jew born into a religiously observant family)
FFC,Free For Chat
FFE,Fukuoka Futures Exchange
FFF,Fédération française de football (French,"French Football Federation")
FFG,Guided Missile Frigate (hull classification symbol)
FFOV,Forward Field Of View
FFR,Fédération française de rugby (French,"French Rugby (Union) Federation")
FFS,For Fuck's Sake
FFT,Final Fantasy Tactics,FG[edit]
FG,Falun Gong
fg,Femtogram
FG,Fog (METAR Code),French Guiana (FIPS 10-4 territory code)
FGR,Flickr Group Roulette
fH,Femtohenry
FHFIF,Foster's Home for Imaginary Friends
FHI,Family Health International,Fuji Heavy Industries,Ltd.
FI,Finland (ISO 3166 digram; FIPS 10-4 country code)
FIA,Fédération internationale de l'automobile (French "International Automobile Federation")
FIAT,Fabbrica Italiana Automobili Torino (Italian "Italian Car Factory of Turin")
FIB,Fucking Illinois Bastard (Wisconsin slang,variants exist)
FIBA,originally  Fédération internationale de basket-ball amateur (French,"International Amateur Basketball Federation"); since 1989, Fédération internationale de basket-ball
FIBUA,Fighting In Built-Up Areas
FIC,Fellowship for Intentional Community
FID,Foreign Internal Defence
FIE,Fly-In Echelon
FIFA,Fédération internationale de football association (French,"International Association Football Federation")
FIFe,Fédération internationale féline (French,"International Feline Federation")
FIFO,First In,First Out
FIFRA,Federal Insecticide,Fungicide,and Rodenticide Act
FIG,Fédération internationale des géomètres (French,"International Federation of Surveyors"),Fédération internationale de gymnastique (French,"International Federation of Gymnastics"),Feminist Improvising Group (music ensemble)
FIGJAM,Fuck I'm Good,Just Ask Me
FILA,Fédération internationale des luttes associées (French,"International Federation of Associated Wrestling Styles"),former name of the sport governing body now known as United World Wrestling
FIMPT,Fellow of the Institute of Maxillofacial Prosthetists and Technologists
FIN,Finland (ISO 3166 trigram)
FINA,(p/a) Fédération internationale de natation (French,"International Swimming Federation")
FIR,Final Inspection Report,Federazione Italiana Rugby (Italian,"Italian Rugby (Union) Federation")
FIRES,Fever Induced Refractory Epilepsy Syndrome or Febrile Infection-Related Epilepsy Syndrome
FIS,"Fédération internationale de ski (French for: International Ski Federation)"
FISA,Fédération Internationale des Sociétés d'Aviron (French,"International Federation of Rowing Associations")
FISH,Fluorescence In-Situ Hybridisation
FiST,Fire Support Team
FITS,Flexible Image Transport System
FIU,Florida International University
fJ,Femtojoule
FJ,Fiji (ISO 3166 digram; FIPS 10-4 country code)
FJI,Fiji (ISO 3166 trigram)
FJN,Financial Job Network
FK,Falkland Islands (ISO 3166 digram; FIPS 10-4 territory code)
fK,Femtokelvin
FKSM,Fort Knox Supplemental Manual
FKT,Fastest Known Time
fL,Femtolitre
FL,Florida (postal symbol)
fl,floruit (Latin,"living") (genealogy)
FLA,Florida,Front Line Assembly,Future Large Aircraft
FLAB,Four-letter abbreviation
FLAC,Free Legal Advice Centres
FLAC,Free Lossless Audio Codec
FLAK,FLugAbwehrKanone (German for "Anti-Aircraft Guns")
FLB,Forward Logistics Base
FLET,Forward Line of Enemy Troops
FLG,Falun Gong
FLIP,Flight Information Publication
FLIR,Forward Looking InfraRed (sensor)
FLK,Falkland Islands (ISO 3166 trigram)
FLOT,Forward Line of Own Troops
FLQ,Free Legal Questions
FLQ,Front de libération du Québec (French for "Québec Liberation Front")
FLSA,Fair Labor Standards Act
FLTSAT,Fleet Satellite
FLTSATCOM,Fleet Satellite Communication System
FLUBOS,Fat,Lazy,Useless,Bag Of Shit
FM,Factory Mutual http://fmglobal.com
FM,Federal Magistrate (Australian post-nominal),Federated States of Micronesia (postal symbol; ISO 3166 digram; FIPS 10-4 territory code),Field Manual,Flight Manager,Frequency Modulation (electronics)
fm,Femtometre
Fm,Fermium
FMC,Federal Magistrates' Court (an Australian federal court,formerly FMS),Food Machinery Corporation (original name of the company now known as FMC Corporation)
FMCA,Federal Magistrates' Court of Australia (used for citing decisions of the FMC other than family law decisions)
FMCAfam,Federal Magistrates' Court of Australia: family (used for citing family law decisions of the FMC)
FMCG,(Fast Moving Consumer Goods)
FME,Formal Methods Europe
FMECA,Failure Modes and Effect Criticality Analysis
FMJD,Fédération Mondiale du Jeu de Dames[2]
FMLA,Family Medical Leave Act
Fmr,Former (As in "Fmr. president")
fMRI,Functional Magnetic Resonance Imaging
FMSF,False Memory Syndrome Foundation
FMTV,Family of Medium Tactical Vehicles
fN,Femtonewton
FNA,Functional Needs Analysis
FOAD,Fuck Off And Die
FOAF,Friend Of A friend
FOB,Forward Operating Base
FoB,Free On Board (shipping)
FOC,Full Operational Capability,First of Class
FoE,Friends of the Earth
FOGC,Federal Oil and Gas Council
FOH,Front Of House
FOIA,Freedom of Information Act
FOM,Federation Object Model
FONSI,Finding of No Significant Impact
FOO,Forward Observation Officer
FOOP,Friends Of Organ Pipes (Volunteer group)
FOR,Field Of Regard,Frame Of Reference
FoS,Family of Systems
FOS,Florida Ornithological Society,Full Operational Status
FOSE,Fallout 3 Script Extender
FOSE,Federal Office Systems Expo
FOT,Free on truck
FOTA,Fellow of the Orthodontic Technicians Association
FOTC,Flight of the Conchords
FOUO,For Official Use Only
FP,French Polynesia (FIPS 10-4 territory code)
FPF,Federação Portuguesa de Futebol ("Portuguese Football Federation" in that language),Final Protective Fire
FPS,Fire Prevention System
FQ,Baker Island (FIPS 10-4 territory code),French Southern and Antarctic Territories (ISO 3166 digram; obsolete 1979)
FR,France (FIPS 10-4 country code; ISO 3166 digram)
Fr,Francium
FRA,Federal Railroad Administration,France (ISO 3166 trigram)
FRAND,Fair,reasonable,and non-discriminatory (concept in standards-setting and intellectual property law)
FRCP,Federal Rules of Civil Procedure,Fellow of the Royal College of Physicians
FRICBM,Full Range ICBM
FRO,Faroe Islands (ISO 3166 trigram)
FRR,Falls Road Railroad (reporting mark),Federaţia Română de Radioamatorism (Romanian,"Romanian Amateur Radio Federation"),Fix,Rebuild,Replace,Federaţia Română de Rugby (Romanian,"Romanian Rugby (Union) Federation")
FRS,Fellow of the Royal Society,U.S. Federal Reserve System
FRSA,Fellow of the Royal Society of Art
FRY,Federal Republic of Yugoslavia
fs,Femtosecond
fS,Femtosiemens
FSA,Fire Support Area,UK Food Standards Agency,Functional Solution Analysis
FSB,Federal'naya Sluzhba Bezopasnosti Rossiyskoi Federatsii (Федера́льная слу́жба безопа́сности Росси́йской Федера́ции,Russian "Federal Security Service of the Russian Federation",succeeded the FSK in 1995),Forward Support Battalion
FSC,Federal Supply Classification,Forest Stewardship Council (ecological pressure group
FSCL,Fire Support Co-ordination Line
FSE,Fire Support Element
FSF,Free Software Foundation
FSH,Follicle Stimulating Hormone
FSI,Fuel Stratified Injection
FSK,Federal'naya Sluzhba Kontrrazvedki (Федера́льная Слу́жба Контрразве́дки,Russian "Federal Counterintelligence Service",succeeded the KGB in 1991)
FSM,Federated States of Micronesia (ISO 3166 trigram),Flying Spaghetti Monster (satirical religion)
FSO,Fire Support Officer,Flotilla Staff Officer,Foreign Service Officer
FSS,Fire Support Station
FSSP,Families of Structurally Similar Proteins
FST,Finance Support Team,Finlands Svenska Television (Finland's Swedish-language television),Future Soviet Tank (Cold War era)
FSTC,Foreign Science Technology Center (now NGIC)
FSV,Fire Support Vehicle,Fisheries Survey Vessel,Flexible Sender Validation,Fort St. Vrain,Fußball und Sportverein (German "Football and Sport Association",as in FSV Mainz),FT[edit]
fT,Femtotesla
FTC,Federal Trade Commission
FTE,Full Time Equivalent
FTL,Faster Than Light
FTS,Flight Termination System used during some rocket launches
FTS,Fuck That Shit
FTSE,Financial Times Stock Exchange ("footsie")
FTW,For The Win (a commonly used phrase used online to indicate success) F@#K The World,Forever Together Where ever (gang slogan)
FU,Smoke (METAR Code)
FUBAR,Fucked/Fouled Up Beyond All Recognition/Repair
FUCK,For,Unlawful,Carnal,Knowledge (Van Halen album title)
FUD,Fear,Uncertainty & Doubt (marketing strategy)
fV,Femtovolt
fW,Femtowatt
FW,Forward
FWC,Football World Cup
FWF,Fixed Word Format
FWI,French West Indies
FWIW,For What It's Worth
FWS,U.S. Fish and Wildlife Service
FWT,Fresh Water Tank
FX,Firefox,Fox Extended,Metropolitan France (ISO 3166 digram; obsolete 1997),Special effect
FXX,Metropolitan France (ISO 3166 trigram; obsolete 1997)
FY,Fiscal Year,Former Yugoslav Republic of Macedonia (NATO country code)
FYA,For Your Agenda
FYDP,Five-Year Defense Plan (U.S.)
FYI,For Your Information
FYROM,Former Yugoslav Republic of Macedonia
FZDZ,Freezing Drizzle (METAR Code)
FZFG,Freezing Fog (METAR Code)
FZRA,Freezing Rain (METAR Code)
G,Gauss,General Audiences (movie rating)
g,Gram
G1,Assistant Chief-of-Staff,Personnel
G10,Group of 10 (G7 + Belgium,Netherlands,Sweden,Switzerland; numbering 11 in fact)
G15,Group of 15 (subset of G77,formed 1989: Algeria,Argentina,Brazil,Chile,Egypt,India,Indonesia,Jamaica,Kenya,Nigeria,Malaysia,Mexico,Peru,Senegal,Sri Lanka,Venezuela and Zimbabwe; currently numbers 17)
G2,Assistant Chief-of-Staff,Intelligence
G20,Group of 20 (G8 + Argentina,Australia,Brazil,China,India,Indonesia,Mexico,Saudi Arabia,South Africa,South Korea,Turkey + current European Union presiding country) (1999)
G24,Group of 24 (subset of G77,formed 1971: Algeria,Argentina,Brazil,Colombia,Côte d'Ivoire,Democratic Republic of the Congo,Egypt,Ethiopia,Gabon,Ghana,Guatemala,India,Iran,Lebanon,Mexico,Nigeria,Pakistan,Peru,Philippines,South Africa,Syria,Sri Lanka,Trinidad and Tobago and Venezuela)
G3,Heckler & Koch G3
G4,Generation Four PowerPC microprocessor,Assistant Chief-of-Staff,Logistics
G5,Generation Five PowerPC microprocessor,Assistant Chief-of-Staff,Public Affairs
G6,Assistant Chief-of-Staff,Information Technology,Group of 6 (France,Germany,United States,Japan,United Kingdom,Italy) (1975)
G7,Assistant Chief-of-Staff,Training,Group of 7 (G6 + Canada) (1976)
G77,Group of 77 (issued from the United Nations Conference on Commerce and Development,1964; currently numbers 133)
G8,Assistant Chief-of-Staff,Finance,Group of 8 (G7 + Russia) (1998)
GA,Gabon (ISO 3166 digram),The Gambia (FIPS 10-4 country code),Gamblers Anonymous,Georgia (postal symbol),Gigaampere,Goa (Indian state code)
Ga,Gallium,Gigaannum
GAAR,General Anti-Avoidance Rule (tax evasion)
GAB,Gabon (ISO 3166 trigram)
GABA,Gamma-AminoButyric Acid
GAD,Generalized Anxiety Disorder
GAF,Garfield and Friends
GALCIT,Guggenheim Aeronautical Laboratory,California Institute of Technology
GAO,U.S. Government Accountability Office
GAW,Global Atmospheric Watch
GB,Gabon (FIPS 10-4 country code),United Kingdom of Great Britain and Northern Ireland (ISO 3166 digram) [glamour boy 7-9/10]
GBBC,Great (Global) Backyard Bird Count
GBE,Knight/Dame Grand Cross of the Order of the British Empire
GBH,Great Bash Heel (Japanese professional wrestling stable),Gregory Bonner Hale (British design and advertising agency),Grievous bodily harm
GBR,United Kingdom of Great Britain and Northern Ireland (ISO 3166 trigram)
GBU,Glide-Bomb Unit,Global Business Unit
GC,East Germany (NATO country code; obsolete 1990),General classification (cycling),General counsel,George Cross (British civil decoration),Gigacoulomb [Grindr cruise]
GCA,Graduate in Claims Administration
GCCS,Global Command and Control System ("geeks")
GCD,see entry
GCF,Greatest Common Factor
GCI,Ground-controlled interception
GCN,Gamma-ray burst Coordination Network
GCS,Global Coordinate System
GCSE,General Certificate of Secondary Education (UK)
Gd,Gadolinium
GD,Grenada (ISO 3166 digram)
GDC,Game Developers Conference,General Dental Council
GDL,Game Definition Language
GDP,General Dental Practitioner (UK),Gross Domestic Product
GDR,General Distribution Release (Microsoft Term for a software service release; between Hotfix and Service Pack)
GDR,German Democratic Republic (cf. DDR)
GDW,Game Designers Workshop
GE,General Electric,Genetic Engineering (cf. GM),Georgia (ISO 3166 digram)
Ge,Germanium
GEBCO,General Bathymetric Chart of the Oceans
GEC,Great Engineering Challenge
GED,General Educational Development (high school equivalency credential in the U.S. and Canada)
GEEP,Geophysical Equipment Exploration Platform
GEMA,Gas and Electricity Markets Authority,Georgia Emergency Management Agency,Gesellschaft für musikalische Aufführungs,und mechanische Vervielfältigungsrechte (German performance rights organisation),Global Engine Manufacturing Alliance
GEN,Full General (four stars) in the U.S. Army
GEO,Geostationary Earth Orbit,Georgia (ISO 3166 trigram)
GEQ,Equatorial Guinea (IOC trigram,but not FIFA or ISO 3166)
GER,Germany (IOC and FIFA trigram,but not ISO 3166)
Gestapo,GEheime STAatsPOlizei (German "secret state police")
GeV,Gigaelectron-volt
GEV,Ground Effect Vehicle
GF,French Guiana (ISO 3166 digram),Gigafarad
GFCF,Gluten-free,casein-free diet,Gross fixed capital formation
GFCI,Ground Fault Circuit Interruptor (aka GFI)
GFE,Girlfriend experience (used in escort services),Good Faith Estimate,Government Furnished Equipment
GFI,Ground Fault Interruptor (aka GFCI)
GFL,German Football League (Germany's Bundesliga for American football; the English-language name is used in German without translation)
GFN,Global Footprint Network
GFY,"good for you" or "go fuck yourself",depending on the context (Internet chat)
GG,Georgia (FIPS 10-4 country code)
GGK,Good God Karma
GGP,General Game Playing,General Growth Properties (U.S. shopping center owner),GH[edit]
GH,Ghana (ISO 3166 digram; FIPS 10-4 country code),Gigahenry
GHA,Ghana (ISO 3166 trigram)
GHB,gamma-Hydroxybutyric acid
GI,Galvanised Iron,Gastro-Intestinal,General Issue,Gibraltar (ISO 3166 digram; FIPS 10-4 territory code),Government Issue
Gi,Gibi
GIB,Gibraltar (ISO 3166 trigram)
GIG,Global Information Grid
GIN,Guinea (ISO 3166 trigram),Guidelines International Network
GINK,Going Insane Not Knowing,orig. Colorado 2010 M.Kalfas
GINO,Godzilla In Name Only
GISS,"General Impression of Size and Shape,Goddard Institute for Space Studies"
GJ,Gigajoule,Grenada (FIPS 10-4 country code),Gujarat (Indian state code)
GJD,Geocentric Julian Day
GK,Gigakelvin,Guernsey (FIPS 10-4 territory code)
GL,Gigalitre,Graphics Language,Greenland (ISO 3166 digram; FIPS 10-4 territory code),Grenade Launcher
GLAAD,Gay and Lesbian Alliance Against Defamation
GLAC,General Ledger Accounting Code
GLAST,Gamma-ray Large Area Space Telescope
GLBA,Gramm-Leach-Bliley Act
GLC,Gas-liquid chromatography
GLINT,Gallium-arsenide Laser Illuminator for Night TV,Gated Laser Illuminator for Narrow Television,Gated Laser Intensifier (tape),Gospel Literature International,Graphical Linux Installation Tool
GLONASS,Globalnaya navigatsionnaya sputnikovaya sistema (Russian Глоба́льная Навигацио́нная Спу́тниковая Систе́ма,"Global Navigation Satellite System")
GLP,Guadeloupe (ISO 3166 trigram)
GLV,Gained Life Value
Gm,Gigametre
GM,"The Gambia (ISO 3166 digram),GameMaster (role-playing),General Motors,Genetically Modified,Germany (FIPS 10-4 country code),Guru Meditation (computing)"
GMAC,"General Motors Acceptance Corporation,the original name of the company now known as Ally Financial,Graduate Management Admission Council,G-MAC,Great Midwest Athletic Conference"
GMB,"The Gambia (ISO 3166 trigram),General,Municipal,Boilermakers (and Allied Trade Union)"
GmbH,Gesellschaft mit beschränkter Haftung (German,"Company with limited liability")
GMC,U.K. General Medical Council,Gospel Music Channel
GMFSC,Ground Mobile Forces Satellite Communications
GMI,Generic Model Interface,Geometry Model Instance
GMO,Genetically Modified Organism
GMPCS,Global Mobile Personal Communications by Satellite
GMT,Giant Magellan Telescope,Greenwich Mean Time,GN[edit]
GN,Giganewton,Guinea (ISO 3166 digram)
GNAS,Grand National Archery Society
GNB,Guinea-Bissau (ISO 3166 trigram)
GNC,"G&C Records" NetLabel,General Nutrition Centers (US sports nutrition retailer branded as GNC)
GNP,Gross National Product
GNQ,Equatorial Guinea (ISO 3166 trigram)
GnRH,Gonadotropin-Releasing Hormone
GO,Glorioso Islands (FIPS 10-4 territory code)
GOA,General of the Army (United States only)
GOA,Gun Owners of America"
GOAT,Greatest Of All Time
GOC,General Officer Commanding
GOES,Geostationary Operational Environmental Satellite
GOP,Grand Old Party
gorp,"granola,oats,raisins,peanuts (another name for trail mix),probably a backronym"
GOSC,General Officer Steering Committee
GOSH,Great Ormond Street Hospital
GOSP,Gas/Oil Separation Plant
GOTS,Government off-the-shelf
GOYADIN,"Get Off Your Arse,Do It Now (anti-procrastination mantra)"
GP,"General Practitioner,General Purpose,Grand Prix,Guadeloupe (ISO 3166 digram; FIPS 10-4 territory code)"
GPA,Grade Point Average
GPC,Global Path Cache
GPIB,General-Purpose Instrumentation/Interface Bus
GPO,General Post Office
GPPC,Genetics and Public Policy Center
GPR,Ground-Penetrating Radar
GPS,"General Problem Solver,Global Positioning System"
GPT,"GEC-Plessey Telecommunications,General Purpose Technology,Get Paid To website"
GPU,Gosudarstvennoye Politicheskoye Upravlenie (Russian Государственное Политическое Управление,"State Political Administration") (1922-1934)
GQ,"Equatorial Guinea (ISO 3166 digram),Gentlemen's Quarterly (the original name of the magazine now known simply as GQ),Guam (FIPS 10-4 territory code),GR[edit]"
GR,"Greece (FIPS 10-4 country code; ISO 3166 digram),Hail (METAR Code)"
GRAIL,Gravity Recovery and Interior Laboratory
GRAS,Generally recognized as safe (FDA list)
GRB,Gamma-Ray Burst
GRC,Greece (ISO 3166 trigram)
GRD,Grenada (ISO 3166 trigram)
GRE,"Graduate Record Examination,Greece (IOC and FIFA trigram,but not ISO 3166)"
grep,"[search] Globally for Regular Expression,Print [lines]"
GRID,Gay-Related Immune Deficiency (original name of AIDS)
GRid,"Global Release Identifier,a music industry identifier from the RIAA and IFPI"
GriT,Girl raised in Texas (Woman presenting firm southern traits/beliefs)
GRL,Greenland (ISO 3166 trigram)
GRN,"Grenada (IOC and FIFA trigram,but not ISO 3166),Goods Received Note"
GRP,Graphite-reinforced plastic,see Carbon-fiber-reinforced polymer
GRU,Glavnoje Razvedyvatel'noje Upravlenije/Главное Разведывательное Управление (Russian,"Main Intelligence Directorate" [of the former Soviet and now Russian armed forces])
GS,General Schedule (US civil service pay scale),General Support,Gigasiemens,South Georgia and the South Sandwich Islands (ISO 3166 digram)
Gs,Gigasecond
GSA,U.S. General Services Administration
GSD,Graphical Situation Display
GSG,German Sport Guns,Global Scenario Group (former environmental research organization),Grenzschutzgruppe (German,"Border Guard Group" — Germany's GSG 9 counterterrorist unit was originally a special branch of the border police)
GSGB,(God send glamour boy 9-10/10)
GSK,GlaxoSmithKline [good sexual karma]
GSM,General Service Medal,Grams per Square Metre (paper thickness; properly g/m2),Ground Station Module,Groupe spécial mobile (French,"Special Mobile Group"; official expansion is now Global System for Mobile Communications)
GSN,Game Show Network
GSO,General Services Officer (U.S. Department of State)
GSOH,Good Sense Of Humour
GSP,Georges St-Pierre (Canadian MMA fighter)
GSR,Gun Shot Residue
GSS,Generic Security Services
GST,Goods and Services Tax (Australia,Canada,and other countries)
GSW,Gunshot wound
GT,Gigatesla,Gran Turismo,Grand Touring,Guatemala (FIPS 10-4 country code; ISO 3166 digram)
GTB,Get to bed,namely to get a new job after a long time of searching,usually following a phone call
GTC,Gran Telescopio Canarias (Spanish,Canaries Great Telescope)
GTD,Getting Things Done
GTG,Got To Go (Internet chat)
GTGN,Getty Thesaurus of Geographic Names
GTK,Good To Know (Internet chat)
GTM,Guatemala (ISO 3166 trigram)
GU,Guam (postal symbol; ISO 3166 digram)
GUA,Guatemala (IOC and FIFA trigram,but not ISO 3166)
GUF,French Guiana (ISO 3166 trigram)
GUI,Graphical user interface ("goo-ey")
GUILT,Gangliated Utrophin Immuno Latency Toxin
Gulag,Glavnoye Upravleniye ispravitelno-trudovykh LAGerei i kolonii (Russian Главное Управление Исправительно—Трудовых Лагерей и колоний,"Main Directorate of Corrective Labour Camps")
GULCR,Grupo de Usuarios de Linux de Costa Rica
GUM,Glavnyi Universalnyi Magazin (Russian Главный Универсальный Магазин,"Main Department Store"; known in Soviet times as Gosudarstvennyi Universalnyi Magazin/Государственный Универсальный Магазин,"State Department Store"),Guam (ISO 3166 trigram),Guide to the expression of Uncertainty in Measurement
GUT,Grand Unification Theory
GV,Gigavolt,Guinea (FIPS 10-4 country code)
GW,Games Workshop,Germ Warfare,Gigawatt,Guided Weapon,Guinea-Bissau (ISO 3166 digram)
GWARS,Ground Warfare System (simulation)
GWAS,Grand Western Archery Society
GWOT,Global War on Terrorism
GWS,Gulf War Syndrome,Greater Western Sydney
GXE,Gene-enivronment interaction
GXM,Matrox Graphics eXpansion Module
GxP,Good X Practice (X can mean: clinical,manufacturing,pharmaceutical,etc.)
GXP,Grid Exit Point,Global Xchange Programme,Indication of highest performance level on some Pontiac vehicles
GY,Guyana (FIPS 10-4 country code; ISO 3166 digram)
GZ,Gaza Strip (FIPS 10-4 territory code),Ground Zero
GZK,Greisen-Zatsepin-Kuzmin cut-off (cosmic ray energies)
h,Hecto
H,Henry,Hydrogen
HA,Haiti (FIPS 10-4 country code),High Availability
HAARP,High Frequency Active Auroral Research Program
HAART,Highly Active Anti-Retroviral Therapy
HAI,Human Awareness Institute
HAL,Hardware Abstraction Layer
HALO,High Altitude Low Opening (parachute jump)
HALT,Highly Accelerated Life Test,Hungry Angry Lonely Tired
HAM,Amateur radio operator
HANS,Head And Neck Support (device used in many race cars)
HARM,High-speed Anti-Radiation Missile
HAT,Highest Astronomical Tide (nautical charts),Hungarian Automated Telescope
HAW,Heavy Antitank Weapon
HAWK,Homing All the Way Killer (air defence system)
HAZ,Heat-Affected Zone
HAZMAT,Hazardous Materials
HBCD,HexaBromoCycloDodecane
HBO,Home Box Office
HBR,Harvard Business Review
HBT,Heterojunction Bipolar Transistor
HBV,Hepatitis B Virus
HCCI,Homogeneous Charge Compression Ignition
HCF,Highest Common Factor
HCSC,Higher Command and Staff Course
HCT,Higher Colleges of Technology,tertiary education institution in the United Arab Emirates (UAE)
HD,Henry Draper (star catalogue),Hull-Down (armoured vehicle target,as opposed to Fully Exposed),High Definition,Huntington's Disease
HDL,High-Density Lipoprotein
HDM,Human Decision-Making
HDR,Henningson,Durham & Richardson (founders of the engineering and construction firm now known by their initials),High dynamic range,a term used in both digital imaging and 3D rendering,Hot Dry Rock (experimental geothermal technology),Human Development Report (UN publication)
HDRA,Henry Doubleday Research Association
He,Helium
HE,High Explosive
HEAT,High Explosive Anti-Tank (ammunition)
HEBA,Hellenic Basketball Clubs Association
HEER,High-Explosive Extended Range (ammunition)
HEIC,Honourable East India Company
HEMP,High-Altitude Electromagnetic Pulse
HEO,High Earth Orbit,Highly Elliptical Orbit
HEOSS,High Earth Orbit Space Surveillance
HEP,High-Explosive Plastic (ammunition)
HEPA,High-Efficiency Particulate Air (filter)
HESH,High-Explosive,Squash-Head (ammunition)
HESV,Heavy Engineering Support Vehicle
HETT,Heavy Equipment Transporting Truck / Heavy Equipment Truck Tractor
HEU,Highly Enriched Uranium
Hewitts,Hills in England,Wales and Ireland over Two Thousand feet (with topographic prominence of at least 30 m)
Hf,Hafnium
HF,High Frequency
HFAC,Human Factors ("aytchfak")
HFE,Human Fertilisation and Embryology (UK Act)
HFE,The common-emitter current gain in a BJT transistor (also represented by βF). See: BJT
HFEA,Human Fertilisation and Embryology Authority (UK)
Hg,Mercury (Latin Hydrargyrum)
HGC,UK Human Genetics Commission
HGF,Human Growth Factor
HGTV,Home & Garden Television
HHB,Ha Ha Bonk,The noise made when you laugh your head off. Used instead of LOL...
HHD,humanitatum doctor (Latin,"doctor of humanities")
HI,Hawaii (postal symbol)
HIDACZ,High-Density Airspace Control Zone ("high dak zed/zee")
HIH,His (or Her) Imperial Highness
HIM,His (or Her) Imperial Majesty
HIMAD,High to Medium Altitude Air Defence (see also H/MAD)
HIMEZ,High Altitude Missile Engagement Zone
HIMYM,How I Met Your Mother
HIPAA,U.S. Health Insurance Portability and Accountability Act
Hipparcos,HIgh Precision Parallax COllecting Satellite
Hird,Hurd of interfaces representing depth (cf. HURD)
HiRISE,High Resolution Imaging Science Experiment
HIT,Health Information Technology
HIV,Human Immunodeficiency Virus
HIWT,Hobart Institute of Welding Technology
HJ,hic jacet (Latin,"here lies")
HJD,Heliocentric Julian Day
HK,Hong Kong (ISO 3166 digram; FIPS 10-4 territory code)
HKG,Hong Kong (ISO 3166 trigram)
HKS,HyperKinetic Syndrome
hL,Hectolitre
HL,Holding Line
HLA,High Level Architecture (simulation),Human Leukocyte Antigen
HLL,High-Level Language
HLN,Headline News
HLOS,High Level Output Specification
HLS,hoc loco situs (Latin,"laid in this place")
HLVW,Heavy Logistics Vehicle,Wheeled
HM,Heard Island and McDonald Islands (ISO 3166 digram; FIPS 10-4 territory code)
HMCE,Her/His Majesty's Customs and Excise (former UK government department; succeeded by HM Revenue and Customs)
HMCS,Her/His Majesty's Canadian Ship,Her Majesty's Courts Service (former UK agency; succeeded by Her Majesty's Courts and Tribunals Service)
HMD,Heard and McDonald Islands (ISO 3166 trigram)
HMF,HydroxyMethyl Furfural
HMMWV,High Mobility Multipurpose Wheeled Vehicle ("hum-vee"; "hummer")
HMO,Health maintenance organization
HMP,Her Majesty's Prison
HMRC,Her/His Majesty's Revenue and Customs
HMS,Helmet-mounted display,Her/His Majesty's Ship (Royal Navy)
HMSO,Her Majesty's Stationery Office
HMV,His Master's Voice
HN,Honduras (ISO 3166 digram)
HND,Honduras (ISO 3166 trigram)
Ho,Holmium
HO,Honduras (FIPS 10-4 country code)
HOLLAND,Hope Our Love Lasts And Never Dies
HOMES,the Great Lakes; Huron,Ontario,Michigan,Erie,Superior
HONY,Humans of New York,a photoblog.
HOPI,Hybrid Optical and Packet Infrastructure (see Internet2,Abilene Network)
HoReCa,Hotel,Restaurant and Catering
HORIZON,Hélicoptère d'observation radar et d'investigation sur zone (French,Zone Investigation and Radar Observation Helicopter)
HOSTAC,Helicopter Operations from Ships Other Than Aircraft Carriers
HOT,Highly Optimised Tolerance
HOTAS,Hands on throttle-and-stick
HOV,High Occupancy Vehicle
HP,Hewlett-Packard,Hindustan Petroleum,Himachal Pradesh (Indian state code)
hp,horse power
HPA,UK Health Protection Agency
HPCL,Hindustan Petroleum Corporation Limited
HPLC,High Performance Liquid Chromatography
HPT,High[er] Payoff Target
HPV,Human Papilloma Virus
HQ,HeadQuarters,Howland Island (FIPS 10-4 territory code)
HQDA,HeadQuarters,Department of the Army
HR,Croatia (FIPS 10-4 country code; ISO 3166 digram,from the country's native name of Hrvatska),Haryana (Indian state code),Harvard Revised star catalogue,Human Resources
HRBL,High-level Representation of Behavior Language (original name of the Herbal language)
HRD,Human Resource Development
HRED,(U.S. Army Research Laboratory's) Human Research and Engineering Directorate (Aberdeen Proving Ground,Maryland)
HRF,High iness Forces
HRH,His (or Her) Royal Highness
HRM,His (or Her) Royal Majesty
HRM,Human Resource Management
HRT,Hormone Replacement Therapy
HRV,Croatia (ISO 3166 trigram),High Resolution Visible,HS[edit]
Hs,Hassium
HSBC,The Hong Kong and Shanghai Banking Corporation
HSC,Higher School Certificate
HSM,High School Musical
HSMAD,Human Science/Modeling and Analysis Data
HSN,Home Shopping Network
HSPH,Harvard School of Public Health
HSS,Health Service Support,High-Speed Steel
HSSI,High-Speed Serial Interface
HST,see entry
HSV,Herpes Simplex Virus,Hue Saturation Value (colour model),HT[edit]
HT,Haiti (ISO 3166 digram),High Temperature,hoc tempore (Latin,"at this time"),hoc titulo (Latin,"under this title")
HTA,HyperText Application
HTC-High Tech Computer Corporation,original name of the company now known simply as HTC,Horry Telephone Cooperative
HTFU,Harden The Fuck Up
HTH,Hope That Helps
HTI,Haiti (ISO 3166 trigram)
HTML,HyperText Markup Language
HTR,Heated Towel Rail
HTS,High-Temperature Superconducting wire
HTTP,HyperText Transfer Protocol
HU,Hungary (ISO 3166 digram; FIPS 10-4 country code)
HUD,Head-Up Display,Housing and Urban Development
HUHA,Head up his/her ass (Marine salute; probably a backcronym)
HUN,Hungary (ISO 3166 trigram)
HURD,Hird of Unix-Replacing Daemons (cf. Hird)
HV,Upper Volta (ISO 3166 digram; obsolete 1984)
HVAC,Heating,ventilation and air conditioning Used in architecture,business and marketing; refers to a building's entire system of heating,moving,or cooling air.
HVAP,High Velocity Armour Piercing (ammunition)
HVHF,High velocity human factors
HVM,High Velocity Missile
HVO,Upper Volta (ISO 3166 trigram; obsolete 1984)
HVP,HarborView Properties,High vacuum process,Hydrolyzed vegetable protein,Human Variome Project,High Velocity Protection,H.V.P. (rapper),High Voltage Protection,High Vapor Pressure,Hub Voice Processor,High-Velocity Projectile,High-Video Pass,High-Velocity Particle
HW,Hardware,High Water (nautical charts)
HWM,Hardware morphing (computer graphics rendering)
HX,IATA code of Hong Kong Airlines,Medical history,Hydrogen halide,Concept automobile by HUMMER
HXB,The glycoprotein Tenascian C
HYS,Harvard,Yale,Stanford (perennially named as the top three law schools in the U.S.)
HZ,Haze (METAR Code)
Hz,Hertz
I,Iodine,One (in Roman numerals)
IA,Iowa (postal symbol)
IAAF,International Association of Athletics Federations ("International Amateur Athletics Federation" from 1912 to 2001)
IAAL,I Am A Lawyer
IAB,International Association for Biologicals
IACREOT,International Association of Clerks,Recorders,Election Officials,and Treasurers
IAD,Ion Assisted Deposition
IADS,Integrated Air Defence System
IAEA,International Atomic Energy Agency
IAF,{i} Industrial Areas Foundation
IAFG,Information Assurance Focus Group
IAI,International African Institute,Israel Aircraft Industries
IANA,Internet Assigned Numbers Authority
IANAL,I Am Not A Lawyer
IAQ,Indoor air quality,Infrequently Asked Questions
IAS,Image Assessment System
IASIP,It's Always Sunny in Philadelphia
IATA,International Air Transport Association
IATF,International Automotive Task Force
IATSE,International Alliance of Theatrical Stage Employees
IAU,International Association of Universities,International Astronomical Union
IAUC,International Astronomical Union Circular
IAW,In Accordance With
IB,International Baccalaureate
IBA,Important Bird Area
IBD,Inflammatory Bowel Disease
IBDM,Information Based Decision Making
IBDS,Integrated Biological Detection System,International Business Development Specialist
IBM,International Business Machines
IBRD,International Bank for Reconstruction and Development (part of the World Bank)
IBS,Irritable Bowel Syndrome
IC,Ice Crystals (METAR Code),Iceland (FIPS 10-4 country code),Integrated Circuit,[inner circle]
ICANN,Internet Corporation for Assigned Names and Numbers
ICAO,International Civil Aviation Organization
ICBM,I see (phonetically "c") BatMan
ICBM,Intercontinental Ballistic Missile
ICBN,International Code of Botanical Nomenclature
ICC,Integrated Command and Control,International Criminal Court,International Cricket Council,Interstate Commerce Commission,International Chamber of Commerce
ICD,Implantable Cardioverter-Defibrillator,Initial Capabilities Document,International Classification of Diseases
ICE,In case of emergency
ICES,International Council for the Exploration of the Sea
ICF,Intelligent Community Forum
ICHTHYS,Iesous Christos,Theou Yios,Soter (Greek,"Jesus Christ,Son of God,Savior")
ICM,Improved Conventional Munition,Integrated Collection Management,International Congress of Mathematicians,Iraq Campaign Medal
ICMP,Internet Control Message Protocol
ICNAF,International Commission for the Northwest Atlantic Fisheries (became NAFO in 1978)
ICNI,Integrated Communication,Navigation,and Identification
ICO,Intermediate Circular Orbit
ICP,Inductively coupled plasma,Insane Clown Posse
ICPE,"International Conference on Pharmacoepidemiology,the annual conference of the International Society for Pharmacoepidemiology"
ICRAF,International Centre for Research in Agroforestry (a.k.a. World Agroforestry Centre since 2002)
ICRISAT,International Crops Research Institute for the Semi-Arid Tropics
ICRL,Individual Component Repair List
ICRS,International Celestial Reference System
ICS,In-Country Support,Intelligence and Communications Systems,Interim Contractor Support
ICSI,Intracytoplasmic Sperm Injection
ICT,Information and communication technologies
ICTH,Island Closest to Heaven/Hell Final Fantasy VIII
ICV,Infantry Carrier Vehicle
ICW,In Co-ordination With,Indonesia Corruption Watch,Infectious and Chemotherapeutic Waste,Insulating Concrete Wall,Integral Crystalline Waterproofing,Interactive Courseware
ICYMI,In Case You Missed It
ICZN,International Code of Zoological Nomenclature,International Commission on Zoological Nomenclature
ID,Idaho (postal symbol),Identity,Indonesia (FIPS 10-4 country code; ISO 3166 digram),Infantry Division,Intelligent Design,ID10T Error,Idiot User Error (IT help desk inside joke)
IDA,U.S. Institute for Defense Analyses,International Development Association (part of the World Bank
IDC,International Data Corporation
IDDI,I don't do initialisms (see irony)
IDE,Integrated Development Environment,Integrated Drive Electronics
IDeA,Improvement and Development Agency,the former name of Local Government Improvement and Development in the United Kingdom
IDEA,Individuals with Disabilities Education Act (U.S.),International Data Encryption Algorithm,International Design Excellence Awards
IDF,Israel Defense Forces,Intel Development Forum,International Dairy Federation
IDGAF,I don't give a fuck
IDK,I don't know
IDKIBTI,I don't know,I'm black,that's it
IDL,Interface Definition Language
IDN,Indonesia (ISO 3166 trigram)
IE,Indo-European languages,Internet Explorer,Ireland (ISO 3166 digram),Iced Earth
IEA,International Energy Agency
IEC,International Electrotechnical Commission
IED,Improvised Explosive Device
IEEE,Institute of Electrical and Electronics Engineers ("I triple-E")
IELTS,International English Language Testing System
IER,Information Exchange Requirement
IET,Initial Entry Training
IET,Institution of Engineering and Technology
IETF,Internet Engineering Task Force
IEW,Intelligence and Electronic Warfare
IFAB,International Football Association Board
IFAH,International Federation for Animal Health
IFAP,International Federation of Agricultural Producers
IFC,International Finance Corporation (part of the World Bank),Independent Film Channel
IFF,Identification,Friend or Foe,Individually Fresh Frozen,International Flavors and Fragrances
IFFN,Identification,Friend,Foe,or Neutral
IFO,Identified Flying Object (see also UFO)
IFOR,UN Implementation Force,Institute for Operations Research,International Fellowship of Reconciliation
IFOV,Instantaneous Field of View
IFPI,International Federation of Phonographic Industries
IFRB,International Frequency Registration Board
IFV,Infantry Fighting Vehicle
IG,Inspector General
IGNOU,Indira Gandhi National Open University
IGS,International Ground Station
IGY,Israeli Gay Youth,International Geophysical Year
IHH,Idiopathic Hypogonadotropic Hypogonadism
IHO,International Hydrographic Organization
IHOP,International House of Pancakes,the original name of this American restaurant chain ("EYE-hop")
IHR,Institute for Historical Review
IHSI,Institutum Historicum Societatis Iesu (Jesuit Historical Institute)
II,Two (in Roman numerals)
IICA,Inter-American Institute for Cooperation on Agriculture
IIE,Innovative Interstellar Explorer
III,Three (in Roman numerals)
IIRC,If I Recall/Remember Correctly
IISS,International Institute for Strategic Studies
IIT,Illinois Institute of Technology,Indian Institutes of Technology,Indiana Institute of Technology
IJN,Imperial Japanese Navy (World War II)
IJWP,Interim Joint Warfare Publication
IKEA,Ingvar Kamprad (the company's founder),Elmtaryd (the farm where he was born and raised),Agunnaryd (a village and parish near the farm)
IL,Illinois (postal symbol),Israel (ISO 3166 digram)
ILC,International Law Commission,International Linear Collider
ILDS,Improved Landmine Detection System
ILO,International Labour Organization
ILRI,International Livestock Research Institute
ILY,I Love You [pronounced ILL-LEE]
IM,Isle of Man (FIPS 10-4 territory code),Instant Message (internet speech)
IMA,Intermediate Maintenance Activity,Institute of Mathematics and Applications
IMBD,International Migratory Bird Day
IMDb,Internet Movie Database
IME,In My Experience
IMF,id music file/id's music format (audio file format),Impossible Missions Force,the protagonist organization in the Mission: Impossible media franchise,International Monetary Fund (the most common use for the initialism)
IMHO,"In My Humble/Honest Opinion"
IML,International Mister Leather
IMLAST,International Movement for Leisure Activities in Science and Technology,see MILSET
IMNM,,Immune-mediated necrotizing myopathy a rare,but serious ADR of statins [1]
IMNSHO,In My Not So Humble Opinion
IMPAC,International Merchant Purchase Authorization Card
IMPACT,International Medical Products Anti-Counterfeiting Taskforce
IMPATT,IMPact Avalanche Transit Time diode
IMPT,Institute of Maxillofacial Prosthetists and Technologists
IMR,Inzhenernaya Mashina Razgrazhdeniya (Russian Инженерные Машины Разграждения,"Engineer Vehicle Obstacle-Clearing") †
IMRI,Industrial Membrane Research Institute,Information Management Research Institute,Institut pour le management de la recherche et de l'innovation (French,"Institute for the Management of Research and Innovation"),International Market Research Information,Intraoperative Magnetic Resonance Imaging
IMRL,Individual Material iness List
IMRO-Internal Macedonian Revolutionary Organization,Irish Music Rights Organisation
IMS,Information Management System,International Meat Secretariat,Ion Mobility Spectrometer
IMSA,Illinois Mathematics and Science Academy,International Mind Sports Association,International Motor Sports Association
IMsL,International Ms. Leather
IMT,Integrated Management Tool
IMU,International Mathematical Union
IN,India (FIPS 10-4 country code; ISO 3166 digram),Indiana (postal symbol),Infantry
In,Indium
INA,Immigration and Nationality Act
INAS,International Near-Earth Asteroid Survey
INC,Iglesia ni Cristo (Filipino,"Church of Christ"),Indian National Congress,International Network of Crackers,Iraqi National Congress
INCITS,InterNational Committee for Information Technology Standards
IND,India (ISO 3166 trigram)
INDIGO,(U.S.) INtelligence DIvision Gaming Operation
inet,the Internet
INFORMS,(U.S.) Institute for Operations Research and the Management Sciences
INFOSEC,Information Security
INLA,Irish National Liberation Army
INMARSAT,International Maritime Satellite organization
INRI,Iesus Nazarenus Rex Iudæorum (Latin for: Jesus of Nazareth,King of the Jews)
INRIA,Institut national de recherche en informatique et en automatique
INS,Immigration and Naturalization Service
InSAR,Interferometric synthetic aperture radar
INST,Information Standards and Technology
INTERFET,International Force for East Timor
INTSUM,Intelligence Summary
IO,British Indian Ocean Territory (ISO 3166 digram; FIPS 10-4 territory code)
IOC,Initial Operational Capability,Intergovernmental Oceanic Commission,International Olympic Committee,International Ornithological Congress
IOLTA,Interest on Lawyer Trust Accounts (charitable funding mechanism,especially for legal aid)
IOM,Iowa,Ohio,Michigan (soybean origin),Institute of Medicine,International Organisation for Migration,Isle of Man
IONA,Islands of the North Atlantic (alternate name for Great Britain,Ireland,the Isle of Man,and related islands)
IOT,British Indian Ocean Territory (ISO 3166 trigram)
IOU,"I Owe You" (Promissory note)
IP,Clipperton Island (FIPS 10-4 territory code),Initial Point,Intellectual Property,Internet Protocol
IPA,India Pale Ale,International Phonetic Alphabet,Isopropyl alcohol
IPB,Intelligence Preparation of the Battlefield
IPCC,Intergovernmental Panel on Climate Change,Independent Police Complaints Commission
IPL,Inferior Parietal Lobule
IPN,Instytut Pamieci Narodowej (Polish,"Institute for National Memory")
IPO,Initial Public Offering
IPR,In Progress Review,Intellectual Property Rights,Intelligence Production Requirement
IPT,Integrated Product/Project Team
IPTS,Institute for Prospective Technological Studies
IPTV,Internet Protocol TeleVision
IPW,Interrogation of Prisoners of War
iq,idem quod (Latin,"the same as")
IQ,Intelligence Quotient,Iraq (ISO 3166 digram)
Ir,Iridium
IRA,Individual Retirement Account,Irish Republican Army (see also List of organisations known as the Irish Republican Army for groups claiming descent from this organisation)
IRAD,Internal Research and Development
IRAN,(I) Inspect and Repair As Necessary
IRAS,Infrared Astronomical Satellite
IRB,International Rugby Board
IRBM,Intermediate Range Ballistic Missile
IRC,International Red Cross,International Reply Coupon
IREA,Intermountain Rural Electric Association
IRINN,Islamic Republic of Iran News Network
IRL,"Ireland (ISO 3166 trigram),Industrial Research Limited,Indy Racing League,In real life"
IRM,Illinois Railway Museum,Inzhenernaya Razvedyvatelnaya Mashina (Russian Инженерная Разведывательная Машина,"Engineer Reconnaissance Vehicle") †
IRN,Iran (ISO 3166 trigram)
IRO,International Refugee Organisation
IRQ,Iraq (ISO 3166 trigram)
IRS,U.S. Internal Revenue Service
IRSN,Institut de radioprotection et de sûreté nucléaire (French,"Institute for Radiation Protection and Nuclear Safety")
IRST,Infra-red Search and Track
IS,Iceland (ISO 3166 digram),Israel (FIPS 10-4 country code)
ISA,Individual Savings Account,Industry Standard Architecture,Instruction Set Architecture,International Seabed Authority
ISAAA,International Service for the Acquisition of Agri-biotech Applications
ISAF,International Sailing Federation,International Security Assistance Force
ISAR,Inverse SAR (Synthetic Aperture Radar)
ISB,Intermediate Staging Base
ISBN,International Standard Book Number (ISO 2108)
ISCCP,International Satellite Cloud Climatology Project
ISCII,Indian Standard Code for Information Interchange
ISDN,Integrated Services Digital Network
ISEF,Intel International Science and Engineering Fair
ISEN,Internet Search Environment Number
ISF,Internal Security Force
ISI-Indian Standards Institute,former name of the Bureau of Indian Standards,Inter-Services Intelligence (Pakistan),Islamic State of Iraq,an umbrella organization for several Iraqi insurgent groups
ISIL,Islamic State of Iraq and the Levant
ISIS,"Institute for Science and International Security, or: Islamic State of Iraq and Syria"
ISL,Iceland (ISO 3166 trigram)
ISLN,International Standard Lawyer Number (used initially by LexisNexis Martindale-Hubbell)
ISM,Industrial,scientific or medical,Interstellar medium
ISMB,International Society of Matrix Biologists
ISMC,Intelligent Sounding Meaningless Conversation
ISO,In Search Of,International Organization for Standardization (from the Greek ίσος,isos,meaning "equal")
ISOGP,Indian Society of Orthodontics for General Practitioners [2]
ISP,International Standardized Profile,Internet Service Provider,Information Systems Professional
ISPE,International Society for Pharmacoepidemiology
ISR,Intelligence,Surveillance and Reconnaissance,Israel (ISO 3166 trigram)
ISRO,Indian Space Research Organisation
ISS,International Shorebird Survey (North America),International Space Station
ISSCR,International Society for Stem Cell Research
ISSN,International standard serial number (ISO 3297)
IST,Information System Technology,UCF Institute for Simulation and Training
ISTAR,Intelligence,Surveillance,Target Acquisition,and Reconnaissance
ISTC,Institute of Scientific and Technical Communications (UK)
ISTS,Intel Science Talent Search
ISU,Integrated Sight Unit,International Skating Union,IT[edit]
IT,InferoTemporal (neurophysiology),Information Technology,Italy (FIPS 10-4 country code; ISO 3166 digram)
ITA,Italy (ISO 3166 trigram)
ITAG,Inertial Terrain-Aided Guidance
ITALY,I'll Truly Always Love You
ITAS,Improved Target Acquisition Sight
ITC,InferoTemporal Cortex (neurophysiology)
ITCZ,Intertropical Convergence Zone
ITEC,Information Technology Exposition & Conference
ITEMS,Interactive Tactical Environment Management System
ITER,International Thermonuclear Experimental Reactor
ITF,International Tennis Federation
ITK,In The Know
ITN,Independent Television News (British)
ITS,Incompatible Time-sharing System,Individual Training Standards
ITT,International Telephone and Telegraph (U.S.)
ITTO,International Tropical Timber Organization
ITU,Intent-to-Use,International Telecommunication Union (International Telegraph Union 1865-1932),IU[edit]
IUCN,International Union for the Conservation of Nature and Natural Resources (World Conservation Union)
IUPAC,International Union of Pure and Applied Chemistry (pronounced "eye-yoo-pac")
IUSS,Integrated Undersea Surveillance System,Integrated Unit Simulation System,International Union of Soil Sciences
IV,Côte d'Ivoire (FIPS 10-4 country code; from Ivory Coast),Four (in Roman numerals),IntraVenous (as in intravenous drip or intravenous therapy)
IVD,Internet Video Device,intra vas device
Iveco,Industrial Vehicles Corporation
IVF,In Vitro Fertilisation
IVI,Interchangeable Virtual Instrument
IVIS,Inter-Vehicle Information System
IVL,Inter-Visibility Line
IVM,In Vitro [Oocyte] Maturation
IVO,In Vicinity Of
IW,Information Warfare
IWARS,Infantry Warrior Simulation
IWC,International Whaling Commission
IWW,Industrial Workers of the World
IX,Nine (in Roman numerals)
IXT,IntraText digital library; IntraText lexical hypertext
IY,Saudi-Iraqi neutral zone (FIPS 10-4 territory code; obsolete 1993)
IZ,Iraq (FIPS 10-4 country code)
J,Joule
J1,Joint [Manpower &] Personnel Directorate
J2,Joint Intelligence Directorate
J2EE,Java 2 Platform,Enterprise ion
J2ME,Java 2 Platform,Micro ion
J2SE,Java 2 Platform,Standard ion
J3,Joint Operations Directorate
J4,Joint Logistics Directorate
J5,Joint Strategic Plans & Policy Directorate
J6,Joint Information Technology Directorate (Command,Control,Communications & Computer Systems)
J7,Joint Operational Plans & Interoperability Directorate
J8,Joint Force Structure,Resources,& Assessment Directorate
JA,Japan (FIPS 10-4 country code)
JAFT,Just A Field Test
JAL,Japan Airlines
JALLC,Joint Analysis and Lessons Learned Centre (NATO)
JAM,Jamaica (ISO 3166 trigram)
JAMA,Journal of the American Medical Association
JANET,Joint Academic Network
JANUS,Joint Academic Network Using Satellites (UK),Joint Army Navy Uniform Simulation,Joint Army-Navy Staff,Just ANother Useless Simulation (Note: The U.S. Army Janus simulation is not an acronym)
JATO,Jet-Assisted Take-Off
JB,Jail Bait
JB,Junior Branch
JBFSA,Joint Blue Force Situational Awareness
JCATS,Joint Conflict And Tactical Simulation ("djay-catts")
JCDB,Joint Common Data Base
JCDS,Joint Chiefs of the Defence Staff
JCIDS,Joint Capabilities Integration and Development System
JCL,Job Control Language
JCP,Java Community Process
JCPM,Java Child Process Manager,Jesus Christ Prison Ministry
JCS,Joint Chiefs of Staff
JCW,Juggalo Championship Wrestling
JD,Jack Daniel's (whiskey),Julian day,Juris Doctor (Latin,"doctor of jurisprudence")
JDBC,Java Data Base Connectivity
JDCC,UK Joint Doctrine and Concepts Centre,now the Development,Concepts,and Doctrine Centre,DCDC
JDEM,Joint Dark Energy Mission
JDL,Jewish Defense League
JDM,Japanese domestic market,referring specifically to automobiles and parts,Java Data Mining,Joint design manufacturing,JE[edit]
JE,Jersey (FIPS 10-4 territory code)
JEB,James Ewell Brown (Stuart),John Ellis Bush
JEDP,Jahwist,Elohist,Deuteronomist,Priestly (according to the documentary hypothesis,the sources of the Torah)
JEE,Java Platform,Enterprise ion
JEFX,Joint Expeditionary Force eXperiment
JEPD,Jahwist,Elohist,Priestly,Deuteronomist,Jointly Exhaustive,Pairwise Disjoint
JET,Joint European Torus
JEZ,Joint Engagement Zone
JFACC,Joint Force Air Component Commander
JFACTSU,U.S. Joint Forward Air Control Training and Standards Unit
JFC,Joint Force Commander
JFCOM,U.S. Joint Forces Command ("jiff-comm")
JFK,John Fitzgerald Kennedy or the airport named after him.
JFLCC,Joint Force Land Component Commander
JFMCC,Joint Force Maritime Component Commander
JFO,Journal of Field Ornithology
JFSOCC,Joint Force Special Operations Component Commander
JFTX,Joint Field Training Exercise
JH,Japan Highway Public Corporation
JH,Jharkhand (Indian state code)
JI,Joint Implementation
JIB,Joint Information Bureau
JIC,Joint Intelligence Centre
JINI,Java Intelligent Network Infrastructure
JITC,Joint Interoperability Test Command
JIVE,Joint Institute for VLBI (Very Long Baseline Interferometry) in Europe
JJAP,Japanese Journal of Applied Physics
JK,Jedi Knight,Just Kidding,Spanair (IATA airline designator),Jammu & Kashmir (Indian state code)
JL,Japan Airlines (IATA airline designator)
JLA,Justice League of America
JM,Jamaica (FIPS 10-4 country code; ISO 3166 digram)
JMS,Java Message Service
JN,Jan Mayen Island (FIPS 10-4 territory code)
JNI,Java Native Interface
JNLP,Java Network Launch Protocol
JO,Jordan (FIPS 10-4 country code; ISO 3166 digram)
JOA,Joint Operations Area
Jofa,Jonssons fabriker (Swedish,"Jonsson's Factories")
JOPES,Joint Operations Planning and Execution System
JOR,Jordan (ISO 3166 trigram)
JOTS,Joint Operations Tactical System
JP,Japan (ISO 3166 digram),Justice of the Peace
JPEG,Joint Photographic Experts Group ("djay-peg")
JPL,Jet Propulsion Laboratory
JPN,Japan (ISO 3166 trigram)
JPOW,Joint Project Optic Windmill
JQ,Jetstar Airways (IATA airline designator),Johnny Quick,Johnston Atoll (FIPS 10-4 territory code),Jonny Quest,Joshua Quagmire
JRA,Japanese Red Army,Joint Rear Area
JRDF,Joint Rapid Deployment Forces
JRE,Java Runtime Environment
JREF,James Randi Educational Foundation
JROC,Joint Requirements Oversight Council
JROCM,JROC Memorandum
JRRF,Joint Rapid Reaction Force
JRSAI,Journal of the Royal Society of Antiquaries of Ireland
JSAF,Joint Semi-Automated Forces ("jay-saff")
JSAP,Japan Society of Applied Physics
JSCSC,Joint Services Command and Staff College
JSD,juris scientiae doctor (Latin,"doctor of science of law")
JSEAD,Joint Suppression of Enemy Air Defence (see SEAD)
JSF,Joint Strike Fighter
JSIMS,Joint Simulation System
JSOA,Joint Special Operations Area
JSOTF,Joint Special Operations Task Force
JSP,JavaServer Page
JSP,Joint Services Publication
JSR,Java Specification Request
JSS,Joint Support Ship Project
JSTARS,Joint Surveillance Target Attack Radar System ("djay-starz")
JT,Johnston Atoll (ISO 3166 digram; obsolete 1986),Junior Technician (RAF)
JTAG,Joint Test Action Group ("djay-tag")
JTAGS,Joint Tactical Ground Station ("djay-tagz")
JTC,Joint Training Confederation
JTF,Joint Task Force
JTFEX,Joint Task Force Exercise
JTIDS,Joint Tactical Information Distribution System ("djay-tidz")
JTLS,Joint Theater Level Simulation
JTMD,Joint Theatre Missile Defence
JTN,Johnston Atoll (ISO 3166 trigram; obsolete 1986)
JTRS,Joint Tactical Radio System ("jitters")
JU,Juan de Nova Island (FIPS 10-4 territory code)
JUGFET,JUnction Gate Field-Effect Transistor
JUICE,JUpiter ICy Moon Explorer
JUO,Joint Urban Operations
JV,Joint Venture,Junior Varsity
JVM,Java Virtual Machine
JW,Jehovah's Witnesses
JWARS,Joint Warfare System (simulation)
JWP,Joint Warfare Publication
JWST,James Webb Space Telescope
JY,Japanese Yen
JZ,Joint Zone
K,Kelvin,Potassium (Latin Kalium),Tanker (aircraft designation code)
k,Kilo-
K,picokelvin
K9,Canine Police Unit
Ka,Kamov Design Bureau
kA,Kiloampere
KA,Knowledge Acquisition,Karnataka (Indian state code)
KAF,Kandahar Air Field
KANUKOKA,Kalaallit Nunaanni Kommunit Kattuffiannit (Kalaallisut,"Greenlandic Communities Association")
KARNAC,Knowledge Aided Retrieval in Activity Context
KARR,Knight Automated Roving Robot (Knight Rider character)
KATUSA,Korean Augmentation To United States Army
KAZ,Kazakhstan (ISO 3166 trigram)
KBE,Knight Commander of the Order of the British Empire
KBO,Kuiper Belt Object
KBVB,Koninklijke Belgische Voetbalbond (Dutch for Royal Belgian Football Association)
kC,Kilocoulomb
KCK,Kansas City,Kansas,Koma Civakên Kurdistan (Kurdish,"Union of Communities in Kurdistan")
KCL,King's College London
KCMO,Kansas City,Missouri (pronounced "K-C-Moe")
KCS,Kansas City Southern Railway (AAR reporting mark)
KD,Kawasaki Disease,Kraft Dinner
KE,Kenya (FIPS 10-4 country code; ISO 3166 digram),Kinetic Energy,Knowledge Engineering
KEDO,Korean Peninsula Energy Development Organization
KEN,Kenya (ISO 3166 trigram)
KERA,Kentucky Education Reform Act (of 1990)
kerma,Kinetic Energy Released in MAterial / in MAtter / per unit MAss
KESR,Kent and East Sussex Railway.
KET,Kentucky Educational Television,Key English Test,KF[edit]
kF,Kilofarad
KFC,Kentucky Fried Chicken
KFOR,UN Kosovo Force
KFUPM,King Fahd University of Petroleum & Minerals
KG,Kyrgyzstan (FIPS 10-4 country code; ISO 3166 digram)
KGB,Komitet Gosudarstvennoy Bezopasnosti (Russian "Committee for State Security") (1954-1991)
KGO,Knight of the Guelphic Order of Hanover
KGZ,Kyrgyzstan (ISO 3166 trigram)
KH,Cambodia (ISO 3166 digram)
kH,Kilohenry
KHL,Kontinental Hockey League
KHM,Cambodia (ISO 3166 trigram)
KHz,Kilohertz
Ki,Kibi
KI,Kiribati (ISO 3166 digram)
KIA,Killed In Action
KIDS,Knowledge-based Integrated Design System
KIR,Kiribati (ISO 3166 trigram)
KISS,Keep It Simple,Stupid / Keep It Short and Simple,Korean Intelligence Support System
KIT,Keep In Touch
KITECH,Korean Institute of Industrial Technology
KITT,Knight Industries Two Thousand,Knight Industries Three Thousand
kJ,Kilojoule
KK,Kabushiki kaisha (Japanese for "Stock Company",found in the legal names of countless Japanese corporations),Košarkarski klub (Slovenian),Košarkaški Klub (Croatian and Serbian in Latin script),Кошаркашки клуб (Serbian Cyrillic),Krepšinio Klubas (Lithuanian); all mean "Basketball Club",as in KK Union Olimpija,KK Cibona,KK Partizan,and KK Atletas
kK,Kilokelvin
KKK,Ku Klux Klan
kL,Kilolitre
KL,Kuala Lumpur,Kerala (Indian state code)
KLENOT,KLEť Observatory Near Earth and Other unusual objects observations Team and Telescope
KLM,Koninklijke Luchtvaart Maatschappij (Dutch "Royal Dutch Airlines")
KLOC,Kilo Lines Of Code
KLS,Kleine-Levin syndrome,Košarkaška liga Srbije (Latin) or Кошаркашка лига Србије (Cyrillic) (Serbian,"Basketball League of Serbia"),Kuala Lumpur Sentral,KM[edit]
KM,Comoros,Knowledge Management
KMFDM,Kein mitleid für die mehrheit (German "No pity for the majority" music band)
KMR,Kwajalein Missile Range
KN,Democratic People's Republic of Korea (FIPS 10-4 country code),Saint Kitts and Nevis (ISO 3166 digram)
kN,Kilonewton
KNA,Saint Kitts and Nevis (ISO 3166 trigram)
KNVB,Koninklijke Nederlandse Voetbal Bond (Dutch for Royal Dutch Football Association)
KO,Knocked Out
KOR,Republic of Korea (ISO 3166 trigram)
KP,Kim Possible
KPMG,Klynveld,Peat,Marwick,Goerdeler
KPNO,Kitt Peak National Observatory
KPV,Krupnokaliberniy Pulemet Vladimorova (Russian КПВТ Крупнокалиберный Пулемет Владимирова,"Large-Calibre Machinegun Vladimirov")[1]
KPVT,Krupnokaliberniy Pulemet Vladimorova Tankoviy (Russian КПВТ Крупнокалиберный Пулемет Владимирова Танковый,"Large-Calibre Machinegun Vladimirov Tank")[2]
KQ,Kenya Airways (IATA airline designator),Kingman Reef (FIPS 10-4 territory code)
KR,Kiribati (FIPS 10-4 country code),Republic of Korea (ISO 3166 digram)
Kr,Krypton
KS,Kansas (postal symbol),Republic of Korea (FIPS 10-4 country code)
kS,Kilosiemens
KSC,Kennedy Space Center
KSI,Killed or Seriously Injured
KSM,Korean Service Medal,Khalid Sheikh Mohammed
KSU,Kansas State University
KT,Christmas Island (FIPS 10-4 territory code),Knight of the Order of the Thistle,Knights Templar
kT,Kilotesla
KTS,Knight of the Tower and Sword (of Portugal)
KU,Kuwait (FIPS 10-4 country code)
KUL,Katholieke Universiteit Leuven (Flemish,Catholic University of Leuven)
KUW,Kuwait (UNDP country code,IOC and FIFA trigram,but not ISO 3166)
KV,Kavminvodyavia (IATA airline designator),Kendriya Vidhyalaya (Indian school),Kliment Voroshilov (tanks),Köchel-Verzeichnis (Mozart catalogue),Valley of the Kings (originally "Kings' Valley")
kV,Kilovolt
KV,Kosovo
KVM,Keyboard,Video,Mouse switch
kW,Kilowatt
KW,Kuwait (ISO 3166 digram)
KWB,Kids' WB!
KWT,Kuwait (ISO 3166 trigram)
KX,Cayman Airways (IATA airline designator)
KY,Cayman Islands (ISO 3166 digram),Kentucky (postal symbol)
KZ,Kazakhstan (FIPS 10-4 country code; ISO 3166 digram)
KZN,KwaZulu-Natal
La,Lanthanum
LA,Laos (FIPS 10-4 country code; ISO 3166 digram),Louisiana (postal symbol),Los Angeles
LAAS,Local Area Augmentation System,Los Angeles Astronomical Society
LAB,Logistics Assault Base
LabVIEW,Laboratory Virtual Instrumentation Engineering Workbench
LACMA,Los Angeles County Museum of Art
LAD,Laser Aiming Device
LADW,Local Air Defence Warning
LAESI,Local Authority & Emergency Service Information
LAMP,(multiple meanings)
LAN,Local Area Network
LANL,Los Alamos National Laboratory
LAO,Laos (ISO 3166 trigram)
LAR,Light Armoured Reconnaissance,Logistics Assistance Representative
LARC,Livermore Advanced Research Computer (cf. LLNL)
LARP,Live-Action Role-Playing
LAS,McCarran International Airport (Las Vegas,Nevada)
Laser,Light Amplification by Stimulated Emission of Radiation (cf. Maser)
LAT,"Lowest Astronomical Tide (nautical charts),Licensed Athletic Trainer (used in many of the United States; see www.oata.org)"
LATA,Local Access Transport Area
LATCH,Lower Anchors and Tethers for Children (U.S. standard for attachment points for child safety seats in passenger cars)
LAV,Land Assault Vehicle,Light Armoured Vehicle,Lymphadenopathy-Associated Virus
LAW,Light Antitank Weapon
LAX,Los Angeles International Airport,The Latin American Xchange (professional wrestling),LB[edit]
LB,Lebanon (ISO 3166 digram)
LBH,Light Battlefield Helicopter,Lyman-Birge-Hopfield bands
LBJ,Lady Bird Johnson,LeBron James,Light Bulb Joke,Little Beagle Johnson (the dog owned by Lyndon and Lady Bird Johnson),Lyndon Baines Johnson
LBN,Lebanon (ISO 3166 trigram)
LBNL,Lawrence Berkeley National Laboratory
LBR,Liberia (ISO 3166 trigram)
LBS,Location-Based Services
lbs,pounds (plural form of lb,see above)
LBT,Large Binocular Telescope
LBW,Leg Before Wicket
LBY,Libya (ISO 3166 trigram)
LC,Line of Contact,Saint Lucia (ISO 3166 digram)
LCA,Saint Lucia (ISO 3166 trigram)
LCC,Land Component Commander
LCCP,Light Contingency Communications Package
LCD,Liquid Crystal Display
LCE,Leaving Certificate Examination,Load Carrying Equipment,London Commodity Exchange
LCM,Least/Lowest Common Multiple
LCol,Lieutenant-Colonel (Canada,UK)
LCS,League of Legends Championship Series
LD,Laser Designator,Limited Deployment,Line of Departure
LDA,Lateral Drift Apparatus (paratroops)
LDAP,Lightweight Directory Access Protocol (pronounced "ell-dap")
LDC,Lesser Developing/Developed Country
LDL,Low-Density Lipoprotein
LDS,Latter-day Saint (also "Latter Day Saint"); also used as an abbreviation by The Church of Jesus Christ of Latter-day Saints,Liberal Democracy of Slovenia
LDV,Local Defence Volunteers (British Home Guard)
LDW,Lane Departure Warning (ADAS)
LE,Lebanon (FIPS 10-4 country code)
LEC,Local Exchange Carrier
LED,Light-Emitting Diode
LEGAD,Legal Advice
Legs,level emotion gad speed
LEMOSS,Long-Endurance MObile Submarine Simulator
LEN,Large Extension Node
LEP,Large Electron-Positron collider
LER,Loss-Exchange Ratio
LEU,Low-Enriched Uranium
LF,Low Frequency
LFO,Low Frequency Oscillation / Oscillator
LFTR,Liquid fluoride thorium reactor
LG,Latvia (FIPS 10-4 country code)
LGB,Lesbian,Gay,Bisexual,Laser-guided bomb,self-explanatory
LGBT,Lesbian,Gay,Bisexual,Transgender
LGLO,Love God,Love Others
LGM,Little Green Men
LGS,Landsat Ground Station
LH,Lithuania (FIPS 10-4 country code),Luteinising Hormone
LHC,Large Hadron Collider
LHD,litterarum humaniorum doctor (Latin,"doctor of humane letters (humanities)"),Left-Hand Drive (automobile)
LHS,Left Hand Side
LI,Fifty-one (in Roman numerals),Liberia (FIPS 10-4 country code),Liechtenstein (ISO 3166 digram)
Li,Lithium
LIBOR,London Interbank Offered Rate
LIBS,Laser Induced Breakdown Spectroscopy
LIE,Liechtenstein (ISO 3166 trigram)
LIFO,Last In,First Out
LIGO,Laser Interferometer Gravitational-Wave Observatory
LINEAR,Lincoln Near-Earth Asteroid Research
LISA,Laser Interferometer Space Antenna
LIVE,Liquid Inertial Vibration Eliminator
LJ,La Jolla,Larry Johnson (both the American football and basketball players of that name),LaserJet (HP printer brand),Library Journal,Linux Journal,LiveJournal,Ljubljana,Lord Justice of Appeal,Sierra National Airlines (IATA code)
LJJ,Lord Justices of Appeal
LK,Sri Lanka (ISO 3166 digram)
LKA,Sri Lanka (ISO 3166 trigram)
LKL,Lietuvos krepšinio lyga (Lithuanian,"Lithuanian Basketball League")
LKR4,Linkwitz-Riley 4th order (audio crossover type)
LL,Land Line (telephone),Last Log,Late Latin,Left Limit,Lex Luthor (Superman character),Light Line,Limited Liability,Linked List,Little League
LLAD,Low Level Air Defence
LLB,Legum Baccalaureus (Latin: Bachelor of Laws)
LLC,Limited Liability Company
LLGC,Llyfrgell Genedlaethol Cymru (National Library of Wales),London Lesbian and Gay Centre
LLLTV,Low-Light Level Television
LLNL,Lawrence Livermore National Laboratory
LLP,Limited Liability Partnership
LLTI,Limiting Long-Term Illness,Long Lead Time Item
LLTR,Low-Level Transit Route
LMAO,Laughing My Ass Off (Internet shorthand)
LMB,Lick My Balls
LMFAO,"Laughing My F**king Ass Off (Internet shorthand,electro-hop duo)"
LMN,Lifetime Movie Network
LMS,Like My Status (Internet shorthand)
LMS,London Mathematical Society,London,Midland and Scottish (Railway)
LMV,() Light Motor Vehicle
LNB,Liga Nacional de Básquet (Rioplatense Spanish,"National Basketball League"; top Argentine league),Ligue Nationale de Basketball (French,"National Basketball League"; the organization that operates France's top two leagues,and the unrelated top league of Switzerland),Low-Noise Block (Satellite dish)
LNER,London and North Eastern Railway
LNG,Liquefied Natural Gas
LNO,Liaison Officer
LNR,Ligue Nationale de Rugby (French,"National Rugby League")
LO,Slovakia (FIPS 10-4 country code)
LOA,Limit Of Advance
LOC,"Level of Operational Capability,Limited Operational Capability,Lines Of Code,Lines Of Communication,see entry"
LOD,Limit of Detection,see Detection limit
LoD,Lines of Development (UK)
LOFAR,Low Frequency Analysis and Recording
LOGPAC,Logistics Package
LOL,Laughing Out Loud (Internet shorthand)
LOMEZ,Low Altitude Missile Engagement Zone
LONEOS,Lowell Observatory Near-Earth-Object Search
LOOGY,(p/a) Lefty One-Out GuY,a sometimes pejorative nickname for the left-handed specialist in baseball
loq,loquitur (Latin," he speaks")
LORTID,LOng Range Target IDentification
LOS,Line Of Sight
LOSAT,Line-Of-Sight Anti-Tank (missile)
LOTA,Licentiate of the Orthodontic Technicians Association
LOTIS,Livermore Optical Transient Imaging System
LOTS,Logistics Over-The-Shore
LP,Linkin Park,Linkup Point,Listening Post,Long Playing record,Louisiana Pacific (cf. LP Field)
LPC,Linear Predictive Coding
LPD,Landing Platform Dock (Navy hull classification),Low Probability of Detection
LPG,Liquefied Petroleum Gas (cf. LNG)
LPI,Low Probability of Intercept
LPS,Landsat Processing System,LipoPolySaccharide
LQ,Palmyra Atoll (FIPS 10-4 territory code)
Lr,Lawrencium
LR,Liberia (ISO 3166 digram)
LRAD,Long Range Acoustic Device ("ell-rad")
LRC,Logistics iness Center
LRF,Laser rangefinder,Low iness Forces
LRGW,Long-Range Guided Weapon
LRICBM,Limited Range ICBM
LRIP,Low Rate Initial Production
LRP,Logistics Release Point
LRPE,Long-Range Planning Element
LRS,Long Range Surveillance
LRU,Line-Replaceable Unit
LS,Landing Support,Lesotho (ISO 3166 digram),Liechtenstein (FIPS 10-4 country code),locus sigilli (Latin,"place of the seal")
LSAT,Law School Admission Test (often pronounced as "el-SAT")
LSD,Landing Ship,Dock (Navy hull classification),librae,solidii,denarii (Latin: Pounds,shillings and pence),lyserg-saüre-dietylamid (German "lysergic acid diethylamide")
LSE,Least Squares Estimate/Error,London School of Economics,London Stock Exchange
LSI,Large-Scale Integration
LSIF,Labour Sponsored Investment Fund
LSND,Liquid Scintillator Neutrino Detector
LSO,Lesotho (ISO 3166 trigram)
LSST,Large Synoptic Survey Telescope
LST,Landing Ship,Tank (World War II; also known,not entirely affectionately,as "Large Slow Target")
LSVW,Light Support Vehicle,Wheeled
LT,Lesotho (FIPS 10-4 country code),Lithuania (ISO 3166 digram)
Lt,Lieutenant
LtC,Lieutenant-Colonel (U.S.)
LTC,Long-Term Costing
Ltd,Limited
LTDP,Long-Term Defence Plan
LTG,Lieutenant General,Lightning (METAR Code)
LTI,Linear Time-Invariant
LTM,Acronym for Laughing To Myself
LTP,Long-Term Potentiation
LTU,Lithuania (ISO 3166 trigram)
LU,Acronym Love You
LU,Loonatics Unleashed
Lu,Lutetium
LUCA,Last Universal Common Ancestor
LUG,Linux User Group
LULU,Locally Unwanted Land Use (urbanism)
LUT,Limited User Test (ing),Local User Terminal
LUVW,Light Utility Vehicle,Wheeled
LUX,Luxembourg (ISO 3166 trigram)
LV,Las Vegas,Latvia (ISO 3166 digram),Launch Vehicle,Leading Vehicle,Leave,Left Ventricle,Level Valve,Linking Verb,Liverpool Victoria
LVA,Latvia (ISO 3166 trigram)
LVAD,Left Ventricular Assist Device,Low-Velocity Airdrop
LVEF,Left Ventricular Ejection Fraction
LW,Land Warrior,Low Water (nautical charts)
Lw,Lawrencium (obsolete 1963)
LWR,Laser warning receiver
LWRC,Land Warfare Resources Corporation
LWS,Land Warrior System
LX,Electrics (theatrical term)
LX,Luxembourg (amateur radio ITU prefix),Swiss International Air Lines (IATA code)
LY,Libya (FIPS 10-4 country code; ISO 3166 digram),Lithuania (amateur radio ITU prefix)
LYAO,Laugh Your Ass Off
LYLAS,Love You Like A Sister
LZ,Bulgaria (amateur radio ITU prefix),Landing Zone
M,Mega-,One thousand (in Roman numerals)
m,Metre,Milli
MA,Madagascar (FIPS 10-4 country code),Marijuana Anonymous,Master of Arts,Massachusetts (postal symbol),Megaampere,Morocco (ISO 3166 digram)
Ma,Megaannum
mA,Milliampere
MAA,Mathematical Association of America
MAAC,Metro Atlantic Athletic Conference
MACE,Multi-Agent Computing Environment
MACHO,MAssive Compact Halo Object
MADD,Mothers Against Drunk Driving,MyoAdenylate Deaminase Deficiency,Multiply-Add
MAF,Maintenance Action Form
MAFF,Ministry of Agriculture,Forestry and Fisheries (various countries)
MAGIC,Major Atmospheric Gamma-ray Imaging Cherenkov (telescope)
MAGNETAR,Metaprogrammable AGent NETwork ARchitecture
MAGTF,Marine Air-Ground Task Force
Mahasz,Magyar Hanglemezkiadók Szövetsége (Hungarian,"Association of Hungarian Record Companies")
MALD,Miniature Air-Launched Decoy
MANPADS,MAN-Portable Air Defence System
MANPRINT,MANpower and PeRsonnel INTegration
MAO,"Molėtų astronomijos observatorija (Moletai Astronomical Observatory),MonoAmine Oxidase"
MAOI,Monoamine oxidase inhibitor
MAPS,Monitoring Avian Productivity and Survivorship
MAQS,Museum of the American Quilter's Society ("max")
MAR,Morocco (ISO 3166 trigram)
MarBEF,Marine Biodiversity and Ecosystem Functioning
MARC,MAchine able Cataloging (often also defined as MAchine able Code),Mailing list ARChive,Massachusetts Animal Rights Coalition,Mid-America Regional Council
MARCENT,United States Marine Forces Central Command
MARFORCC,Marine Force Component Commander
MARRS,Martyn Young,Alex Ayuli,Rudy Tambala,Russell Smith,and Steve Young (British electronic music act)
MASAS,Monte Agliale Supernovae and Asteroid Survey
Maser,Microwave Amplification by Stimulated Emission of Radiation
MASH,Mobile Army Surgical Hospital
MASINT,Measurement And Signature Intelligence
MATREX,Modeling Architecture for Technology,Research & EXperimentation
MAVS,Mobile Artillery Vehicle System
MAW,Malawi (IOC trigram,but not FIFA or ISO 3166)
MAX,Meta-reasoning Architecture for "X"
MB,Manitoba (postal symbol),Martinique (FIPS 10-4 territory code),Medal of Bravery (Canada)
MBA,Main Battle Area,Main Belt Asteroid,Masters of Business Administration
MBBL,(U.S. Armor Center) Mounted Battlespace Battle Laboratory
MBCC,Migratory Bird Conservation Commission (U.S.)
MBCS,Multi-Byte Character Set
MBE,Member of the Order of the British Empire,Multistate Bar Examination (U.S.)
MBI,Moody Bible Institute
MBIDST,Member of the British Institute of Dental and Surgical Technologists
MBM,Meat and Bone Meal
mbsf,metres below sea floor,[1][2] a depth convention used in paleontology and oceanography
MBT,Main Battle Tank
MBTA,Massachusetts Bay Transportation Authority,Migratory Bird Treaty Act (U.S.)
MBTI,Myers-Briggs Type Indicator
mC,Millicoulomb
MCA,Master of Computer Applications,Micro Channel Architecture,MultiChannel Analyzer,Music Corporation of America,the original name of the now-defunct MCA Inc.
MCC,Marylebone Cricket Club,Mission Control Center,Motor Control Center,Movement Control Centre
MCD,Minimal Cerebral Dysfunction,Minor civil division (U.S. Census term)
MCDL,Model Composition Definition Language
MCFT,Modified Compression Field Theory
MCG,Melbourne Cricket Ground
MCI,Microwave Communications,Inc.
MCIS,Mellon Collie and the Infinite Sadness
MCM,Mine Counter-Measures
MCMV,Mine Counter-Measure Vessel
MCNC,Microelectronics Center of North Carolina,Mixing Condensation Nucleus Counter
MCP,Maintenance Collection Point,Male Chauvinist Pig
MCR,My Chemical Romance
MCSF,Marine Corps Security Forces
MCT,Movement Control Team
MCTIS,Mounted Co-operative Target Identification System
MCU,Marine Corps University,Marvel Cinematic Universe,Medium close-up (camera direction in British TV scripts),Microcontroller unit,Milk clotting units,Ming Chuan University,Minimum coded unit (digital imaging),Multipoint control unit,Municipal Credit Union (New York),MD[edit]
Md,Mendelevium
MDA,Main Defensive Action/Area,Moldova (ISO 3166 trigram),Muscular Dystrophy Association
MDF,Main distribution frame,Medium-density fiberboard
MDG,Madagascar (ISO 3166 trigram),UN Millennium Development Goal
MDM,Michigan Dartmouth MIT telescope consortium,Master data management
MDMA,MethyleneDioxy-MethylAmphetamine (also known as "Ecstasy")
MDNA,Madonna's 12th studio album title (2012)
MDO,Membership Driven Organisation
MDP,Markov Decision Process
MDT,Mountain Daylight Time (UTC-6 hours)
MDV,Maldives (ISO 3166 trigram)
ME,Maine (postal symbol),Mechanical engineer[ing],Medical examiner,Middle East,Middle East Airlines (IATA code),Memory Effect,Myalgic Encephalomyelitis
Me,Messerschmitt
MEA,Maine Educational Assessment,Middle East Airlines,Millennium Ecosystem Assessment,Minimum en route altitude,Mono-ethanol Amine,Multilateral Environmental Agreement
MEAC,Mid-Eastern Athletic Conference (ME-ac)
MEC,Maine Central Railroad,Manta,Ecuador (IATA location identifier),Model European Council,Mountain East Conference,Mountain Equipment Co-op
MECC,Minnesota Educational Computing Consortium (later Corporation,dissolved 1999)
MECCA,Milwaukee Exposition Convention Center and Arena,a former name for the sports venue now known as UW-Milwaukee Panther Arena
MECO,Main engine cutoff (NASA code for point in Space Shuttle assent when three main engines are shut down prior to External Tank (ET) separation)
MEDEVAC,Medical evacuation
MEDLI,Mars Science Laboratory Entry,Descent,and Landing Instrumentation,Medical & Scientific Libraries of Long Island,Model for Effluent Disposal using Land Irrigation
MEDS,Mission Essential Data Set
MEF,U.S. Marine Expeditionary Force,Minimum essential facility,Mission essential force
MEG,MagnetoEncephaloGraphy
MEI,Matsushita Electric Industrial Co.,Ltd.
MEK,Magyar Elektronikus Konyvtar,Message encryption key,Methyl ethyl ketone,Mujahideen al-Khalq
MEL,Maya Embedded Language,Michigan Electronic Library
MELT,Metallic Line/Loop Test (ing)
MEM,Message Exchange Mechanism,Microelectromechanical
MEMS,Microelectromechanical System
MEO,Medium earth orbit,Most efficient organization
MEP,Mechanical Electrical Plumbing,Member of the European Parliament,Missions étrangères de Paris (French for "Paris Foreign Missions"),Model European Parliament
MER,Mars Exploration Rover
MERL,Mitsubishi Electric Research Laboratories
MES,Manufacturing Execution Systems
MES,Marconi Electronic Systems,Medium Edison screw
MESSENGER,MErcury Surface,Space ENvironment,GEochemistry and Ranging
MET,Meteorological,Middle European Time
METAR,[Meteorological] Aviation Routine weather report
METL,Mission Essential Task List ("mettle")
METOC,Meteorological and Oceanographic
MEU,U.S. Marine Expeditionary Unit,Maximum Expected Utility
MEV,Medical Evacuation Vehicle,Musica Elettronica Viva
MeV,Megaelectronvolt
MEX,Mexico (ISO 3166 trigram)
MEZ,Missile Engagement Zone
MF,Mayotte (FIPS 10-4 territory code),Megafarad
mF,Millifarad
MFSB,Mother,Father,Sister,Brother (1970s Philadelphia studio musicians collective)
MG,Machine Gun,Madagascar (ISO 3166 digram),Major General,Mongolia (FIPS 10-4 country code),Morris Garage
Mg,Magnesium,Megagram
MGB,Medium Girder Bridge,Motor Gun Boat
MGM,Metro Goldwyn Mayer,Montgomery,Alabama (Airport Code)
MGPAM,My Gym Partner's a Monkey
MGS,Mobile Gun System
MH,Marshall Islands (postal symbol; ISO 3166 digram),Megahenry,Montserrat (FIPS 10-4 territory code)
mH,Millihenry
MHC,Major Histocompatibility Complex
MHHW,Mean Higher High Water (nautical charts)
MHL,Marshall Islands (ISO 3166 trigram)
MHLW,Mean Higher Low Water (nautical charts)
MHRA,(UK) Medicines and Healthcare products Regulatory Agency
MHW,Mean High Water (nautical charts)
MHWN,Mean High Water Neaps (nautical charts)
MHWS,Mean High Water Springs (nautical charts)
MHz,Megahertz
Mi,Mebi
MIA,Missing In Action
MIAA,Maryland Interscholastic Athletic Association,Massachusetts Interscholastic Athletic Association,Michigan Intercollegiate Athletic Association,Mid-America Intercollegiate Athletics Association
MIB,Men In Black,Mint In Box (Internet auction/trading listings)
MICLIC,Mine Clearing Line Charge
MICOM,Missile Command
MID,Midway Islands (ISO 3166 trigram; obsolete 1986)
MIDAS,Man-machine Integration Design and Analysis System
MIDI,Musical Instrument Digital Interface
MIDS,Multi-Function Information Distribution System
MIFG,Shallow Fog (METAR Code)
MIKE,Monitoring of Illegal Killing of Elephants
MIL,Man-In-the-Loop
MILAN,Missile d´infanterie léger antichar (French,"Anti-Tank Light Infantry Missile")
MILC,Mirrorless interchangeable-lens camera
MILF,Mother I'd Like to Fuck
MILSET,Mouvement International pour le Loisir Scientifique Et Technique (French,"International Movement for Leisure Activities in Science and Technology")
MIMAROPA,Mindoro,Marinduque,Romblon,Palawan (a region in the Philippines)
MIMOSA,MIcroMeasurements Of Satellite Acceleration
MIMPT,Member of the Institute of Maxillofacial Prosthetists and Technologists
MIP,Multilateral Interoperability Programme,Multiple Identity Poster
MIRA,MILAN Infra-Red Acquisition (thermal sight)
MIRV,Multiple Independent Reentry Vehicle
MIS,Management Information Systems,Museum Information System
MISREP,Mission Report
MISSI,Multilevel Information System Security Initiative
MIT,Massachusetts Institute of Technology,methylisothiazoline,Milli Istihbarad Teskilati (Intelligence service of Turkey)
MITL,Man-In-The-Loop
MITS,see entry
MJ,Megajoule,Michael Jordan
mJ,Millijoule
MJD,Modified Julian Day
mK,Millikelvin
MKG,Michael Kidd-Gilchrist (American basketball player)
MKO,Mojahedin-e-Khalq Organization (Persian,"People's Mujahedin of Iran")
MKS,Metre-Kilogram-Second (system of units),MKS Inc. software company
MKSA,Metre-Kilogram-Second-Ampere (system of units)
ML,Mali (FIPS 10-4 country code; ISO 3166 digram),Maximum Likelihood,Megalitre
mL,Millilitre
MLA,Martial Law Administration of Bangladesh,Master of Landscape Architecture,Medical Library Association,Member of Legislative Assembly,Modern Language Association,Mutual legal assistance treaty,Myelosis Leucemica Acuta
MLB,Major League Baseball
MLC,Member of the Legislative Council (in India)
MLE,Maximum likelihood estimation
MLHW,Mean Lower High Water (nautical charts)
MLI,Mali (ISO 3166 trigram)
MLK,Martin Luther King,Jr.
MLL,Major League Lacrosse
MLLW,Mean Lower Low Water (nautical charts)
MLP,My Little Pony
MLRS,Multiple-Launch Rocket System
MLS,Major League Soccer,Multiple Listing Service
MLSE,Maple Leaf Sports & Entertainment (owner of several Toronto-based sports teams),Maximum likelihood sequence estimation
MLSR,Missing,Lost or Stolen Report
MLT,Malta (ISO 3166 trigram)
MLVW,Medium Logistics Vehicle,Wheeled
MLW,Mean Low Water (nautical charts)
MLWN,Mean Low Water Neaps (nautical charts)
MLWS,Mean Low Water Springs (nautical charts)
Mm,Megametre
mm,Millimetre
MMA,Mixed martial arts,Moving Mechanical Assembly
MMC,Machinist's Mate,Chief (USN rating),Materiel Management Centre
MMCM,Machinist's Mate,Master Chief (USN rating),Magnetic Mine Counter Measure
MMCS,Machinist's Mate,Senior Chief (USN rating)
MMEV,Multi-Mission Effects Vehicle
MMI,Magical MonkeyZ Inc.
MMI,Man-Machine Interface
MMI,McLean Meditation Institute
MMIC,McLean Meditation Institute Certified
MMIC,Mindfulness & Meditation Instructor,Certified
MMO,Massively Multiplayer Online (computer game)
MMOR,Master of Management in Operations Research
MMORPG,Massively multiplayer online role-playing game
MMPR,Mighty Morphin Power Rangers
MMR,Measles,Mumps and Rubella vaccine,Myanmar (ISO 3166 trigram)
MMS,Multimission Modular Spacecraft
MMU,Manchester Metropolitan University,Manned Manoeuvring Unit
MMW,Millimetre Wave (radar,from "mm Wave")
Mn,Manganese
MN,Meganewton,Minnesota (postal symbol),Monaco (FIPS 10-4 country code),Mongolia (ISO 3166 digram)
mN,Millinewton
MNB,Multinational Brigade
MND,Motor Neurone Disease,Multinational Division
MNE,Montenegro (ISO 3166 trigram)
MNG,Multiple-image Network Graphics,Mongolia (ISO 3166 trigram)
MNMF,Multi-National Maritime Force
MNP,Northern Mariana Islands (ISO 3166 trigram)
MNS,Mission Needs Statement
MO,Macau (ISO 3166 digram),Medical Officer,Missouri (postal symbol),modus operandi (Latin,"mode of operation"),Morocco (FIPS 10-4 country code) [mutual oral]
Mo,Molybdenum
MOA,Museum of Art (Brigham Young University)
MOAB,Massive Ordnance Air Blast (official),Mother Of All Bombs (slang)
MOB,Man Over Board,Marching Owl Band,Movable Object Block
MOC,Macedonian Orthodox Church,Measure Of Capability,Mission Operations Centre,My Own Creation (Lego)
MOCAS,Mechanization Of Contract Administration Services
MOD,Magneto-optical disc,Masters of Deception,Minimum Object Distance,Multiple Organ Dysfunction
MoD,Ministry of Defence (United Kingdom) and various other countries
MoDAF,Ministry of Defence Architecture Framework ("moh-daff")
modem,Modulator-Demodulator
Moe,Marvel of entertainment
MOE,Measure Of Effectiveness
MOF,Ministry of Finance (Japan)
MOFA,Ministry of Foreign Affairs (Japan)
MOH, Medal of Honor,Music On Hold
MOID,Minimum Orbital Intersection Distance
MOJWA,Movement for Oneness and Jihad in West Africa
MOLO,Mobile Other Licensed Operator (UK)
MOM,Master's Degree in Oriental medicine
MOM,Message Oriented Middleware
MoM,Multiple of the median
MoMA,Museum of Modern Art (NYC)
MOND,Modified Newtonian Dynamics
MOO,Measure Of Outcome
MOPE,Ministry of Population and Environment (Nepal),Most Oppressed People Ever (politics)
MOPP,Mission-Oriented Protective Posture
MORP,Meteorite Observation and Recovery Project
MOSFET,Metal-Oxide-Semiconductor Field-Effect Transistor
MOSS,MObile Submarine Simulator,Moving Object Support System
MOT,Ministry of Transport (UK)
MOTA,Member of the Orthodontic Technicians Association
MOTESS,Moving Object and Transient Event Search System
MOTO,Mail Order / Telephone Order,Master of the obvious
MOU,Memorandum Of Understanding
MOVES,Modeling,Virtual Environments,and Simulation Institute
MOW,Maintenance of way (also MW)
MOZ,Mozambique (ISO 3166 trigram)
MPA,Maritime Patrol Aircraft,Master of Public Administration
MPa,Megapascal
mPa,Millipascal
MPAA,Motion Picture Association of America
MPC,Minor Planet Center,Minor Planet Circular
MPEC,Minor Planet Electronic Circular
MPEG,Motion Pictures (Coding) Experts Group
MPEV,Multi-Purpose Engineering Vehicle
MPF,Maritime Prepositioning Force
MPFC,Medial PreFrontal Cortex
MPG,Miles Per Gallon
MPMC,Medial PreMotor Cortex
MPSI,Member of the Pharmaceutical Society of Ireland
MPSoC,MultiProcessor System-on-Chip
MPSRON,Maritime Propositioning Ship Squadron
MQ,Martinique (ISO 3166 digram),Midway Islands (FIPS 10-4 territory code)
MR,Mauritania (FIPS 10-4 country code; ISO 3166 digram)
MRAV,Multi-Role Armoured Vehicle
MRBM,Medium Range Ballistic Missile
MRC,Maintenance Requirements Card
MRD,Motorized Rifle Division
MRGO,Mississippi River-Gulf Outlet Canal (also referred to as MR-GO or "Mr. Go")
MRGW,Medium-Range Guided Weapon
MRI,Magnetic Resonance Imaging
MRL,Multiple Rocket Launcher
MRPharmS,Member of the Royal Pharmaceutical Society (Great Britain)
MRR,Maximum Rock and Roll,Minimum-Risk Route,My Restaurant Rules
MRS,Magnetic Resonance Spectroscopy
MRSA,Methicillin-resistant Staphylococcus aureus
MRT,Mass Rapid Transit — used as either an official or unofficial name for metro systems in Singapore,Kaoshiung,Bangkok,Taipei,Chennai,and Delhi,Mauritania (ISO 3166 trigram)
MRTFB,U.S. Major Range and Test Facility Base
MS,mano sinistra (Latin,"left hand"),manuscript,Master of Science,Megasiemens,Microsoft (sometimes M$),Mississippi (postal symbol),Montserrat (ISO 3166 digram),Multiple Sclerosis,M&S,Modelling & Simulation,Marks & Spencer
Ms,Megasecond
mS,Millisiemens
MSB,Main Support Battalion,Most Significant Bit (or Byte)
MSD,Minimum Safe Distance
MSDB,Multi Source Data Base
MSE,Multiple Subscriber Element
MSEC,Message Security Encryption Code ("emm-sec")
MSG,Message
MSG,MonoSodium Glutamate,Madison Square Garden (either the 1879,1890,1925,or current versions of the venue)
MSH,Medium Support Helicopter,Mount Saint Helens
MSI,Micro-Star International,Multispectral imagery
MSIE,Microsoft Internet Explorer,Master of Science in Industrial Engineering
MSL,Mars Science Laboratory,Mean Sea Level,Missile
MSLP,Mean Sea Level Pressure
MSM,Mainstream media,Men who have sex with men,Mount St Mary's School
MSN,Microsoft Network,Master of Science in Nursing
MSNBC,Microsoft National Broadcasting Company Cable news channel (see also msnbc.com)
MSO,Multiple System Operator
MSPA,Migrant and Seasonal worker Protection Act,MS Paint Adventures
MSPB,Merit Systems Protection Board
MSR,Main Supply Route,Module Service Record,Montserrat (ISO 3166 trigram),Motor Schlepp Regulung,Mountain Safety Research (outdoor supplies manufacturer)
MSSA,Methicillin-susceptible Staphylococcus aureus
MST,Madison Symmetric Torus,Mountain Standard Time (UTC-7 hours),MST3K or MST3k,Mystery Science Theater 3000
MSU,Michigan State University,Montana State University,Mountain State University,Lomonosov Moscow State University (Russia,a.k.a. MGU),MT[edit]
Mt,Meitnerium
mT,Millitesla
MTA,Metropolitan Transportation Authority (Boston) (now Massachusetts Bay Transportation Authority),Metropolitan Transportation Authority (New York)
MTBF,Mean time between failures
MTF,Magnetized target fusion,Medical Treatment Facility,Message Text Format,Modulation transfer function (optics)
MtF,Male-to-female transsexual
MTG,Magic: The Gathering
MTOE,Modified Table of Organization and Equipment ("emm-toe")
MTP,Maritime Tactical Publication,Materiel Transfer Plan,Mission Training Plan
MTQ,Martinique (ISO 3166 trigram)
MTS,Maintenance Training System,Manitoba Telecom Services,Michigan Terminal/Timesharing System,Movement Tracking System,Multichannel television sound,Multi-Technical Services
MTT,Methylthiazol tetrazolium (assay)
MTU,Tankovei Mostoukladchik (Russian Танковый Мостоукладчик,"Tank Bridge-Layer") †
MTV,MainosTeleVisio (Finnish commercial TV company),Music TeleVision
MTVL,Mobile Tracked Vehicle,Light
MTWS,MAGTF Tactical Warfare System
MU,Mauritius (ISO 3166 digram),Oman (FIPS 10-4 country code; from Muscat)
MUS,Mauritius (ISO 3166 trigram)
MV,Maldives (FIPS 10-4 country code; ISO 3166 digram),Megavolt,Motor Vehicle,Motor Vessel
mV,Millivolt
MVC,Missouri Valley Conference
MVFC,Missouri Valley Football Conference
MVNO,Mobile virtual network operator
MW,Maintenance of way (also MOW),Malawi (ISO 3166 digram),Medium Wave (radio),Megawatt,Mountain West (Conference) (formal initialism since July 2011)
mW,Milliwatt
MWC,Maritime Warfare Centre (various nations),Mountain West Conference (still used informally,although the league has adopted "MW")
MWESH,Machismo Wizards Extended SHelter (operating system)
MWI,Malawi (ISO 3166 trigram)
MWOA,Mount Wilson Observatory Association
MWR,Morale,Welfare,and Recreation
MWTB,Mounted Warfare Test Bed
MX,Mail Exchange,Mexico (FIPS 10-4 country code; ISO 3166 digram),Missile eXperimental
MY,Malaysia (FIPS 10-4 country code; ISO 3166 digram)
MYOB,Mind Your Own Business
MYS,Malaysia (ISO 3166 trigram)
MYT,Mayotte (ISO 3166 trigram)
MZ,Mach-Zehnder (interferometer),Magnetic Azimuth,Move,Zig (Zero Wing),Mozambique (FIPS 10-4 country code; ISO 3166 digram)
n,Nano
N,Newton,Nitrogen,North
N3F,National Fantasy Fan Federation
NA,Namibia (ISO 3166 digram),Narcotics Anonymous,National Archives,Negative Acknowledge
nA,Nanoampere
Na,Sodium (Latin Natrium)
NAA,N-Acetylaspartate
NAACP,National Association for the Advancement of Colored People ("N double-A CP")
NAAD,North American Air Defense
NAAFI,Navy,Army and Air Force Institute (UK),No Ambition And Fuckall Interest (RSA army slang)
NAAK,Mark I NAAK,Nerve Agent Antidote Kit
NAAQS,National Ambient Air Quality Standards
NAAWS,NATO Anti-Air Warfare System
NABCI,North American Bird Conservation Initiative ("nab-see")
NAC,"National Agency Check,U.S. Naval Avionics Center,U.S. Navy Advanced Concepts,North Atlantic Council,Northern Area Command"
NACA,(U.S.) National Advisory Committee for Aeronautics (1915-1958,became NASA)
NACC,North Atlantic Cooperation Council
NACISA,NATO Communications and Information Systems Agency
NACMA,NATO Air Command and Control System Management Agency
NACRA,North America Caribbean Rugby Association (more specifically rugby union)
NAEC,U.S. Naval Air Engineering Center
NAF,NATO Architecture Framework,Naval Air Facility
NAFERA,Native American Free Exercise of Religion Act
NAFLD,NonAlcoholic Fatty Liver Disease
NAFO,Northwest Atlantic Fisheries Organization
NAFTA,North American Free Trade Agreement
NAGPRA,Native American Graves Protection and Repatriation Act
NAI,Named Area of Interest,Network Access Identifier
NAICS,North American Industry Classification System
NAIL,Neurotics Anonymous
NAILS,National Airspace Integrated Logistics System
NAIRU,Non Accelerating Inflation Rate of Unemployment
NAK,Negative Acknowledge
NAM,Namibia (ISO 3166 trigram)
NAMBLA,North American Man-Boy Love Association
NAMRL,Naval Aerospace Medical Research Laboratory
NaN,Not A Number (computing)
NAO,UK National Audit Office
NAPDD,Non-Acquisition Program Definition Document ("nap-dee-dee")
NAPS,Navy Acquisition Procedures Supplement
NARA,(U.S.) National Archives and Records Administration
NARAL,National Abortion Rights Action League
NARDAC,Naval Regional Data Automation Center
NARDIC,U.S. Navy Acquisition Research and Development Information Center
NARPV,National Association for Remotely Piloted Vehicles
NAS,National Academy of Sciences,National Air Space,National Audubon Society,Naval Air Station,New Attack Submarine
NASCAR,National Association for Stock Car Auto Racing
NASDAQ,National Association of Securities Dealers Automated Quotations
NASED,National Association of State Election Directors [1][2]
NASH,Non-Alcoholic Steatohepatitis
NASP,National Aerospace Plane
NASS,National Association of Secretaries of State [3]
NatGeo,National Geographic
NATO,National Association of Theatre Owners,North Atlantic Treaty Organisation
NaUKMA,National University of Kyiv-Mohyla Academy
NAV,Navigation[al]
NAVCAMS,Naval Communications Area Master Station
NAVCC,National Audio-Visual Conservation Center
NAVCENT,Naval Forces U.S. Central Command
NAVDAC,Naval Data Automation Command
NAVEUR,Naval Forces U.S. European Command
NAVFE,U.S. Naval Forces,Far East
NAVFOR,Naval Force
NAVMACS,Naval Modular Automatic Communication Subsystem
NAVNET,Navy Network
NAVS,Non-Cooperative Airborne Vector Scoring
NAVSAT,Navigation Satellite
NAVSPACECOM,U.S. Navy Space Command
NAVSPASUR,U.S. Naval Space Surveillance System
NAVSTAR,Navigation Satellite Timing And Ranging
NAVTACNET,Navy Tactical Network
NAWC,U.S. Naval Air Warfare Center
NAWMP,North American Waterfowl Management Plan ("gnaw-wump")
NB,New Brunswick (postal symbol),nota bene (Latin,"mark well")
Nb,Niobium
NBA,National Basketball Association
NBACC,U.S. National Biodefense Analysis and Countermeasures Center ("enn-back")
NBC,National Broadcasting Corporation,Nuclear,Biological,and Chemical
NBCRS,NBC (Nuclear,Biological,and Chemical) Reconnaissance System
NBIC,Nanotechnology,Biotechnology,Information Technology,Cognitive Science
NBL,National Basketball League (Australia)
NBT,Nitroblue tetrazolium (assay)
nC,Nanocoulomb
NC,Network Computer,New Caledonia (ISO 3166 digram),Node Centre,Non-Consensual,Normally Closed,North Carolina (postal symbol)
NCA,National Command Authority
NCAA,National Collegiate Athletic Association ("NC double A")
NCAR,U.S. National Center for Atmospheric Research
NCB,National Codification Bureau
NCCAM,U.S. National Center for Complementary and Alternative Medicine
NCCUSL,National Conference of Commissioners on Uniform State Laws (U.S.)
NCDDR,U.S. National Center for the Dissemination of Disability Research
NCES,U.S. National Center for Education Statistics,Net-Centric Enterprise Services
NCI,U.S. National Cancer Institute
NCIS,National Criminal Intelligence Service (British),Naval Criminal Investigative Service (U.S. Navy; see also NCIS,a U.S. TV series based on this unit)
NCL,New Caledonia (ISO 3166 trigram)
NCLR,National Council of La Raza
NCMO,No Commitment Make Out
NCND,Non Circumvention & Non Disclosure,Neither Confirm Nor Deny,New Concept New Design
NCO,Non-Commissioned Officer
NCP,Net Contracted Purchases
NCR,National Cash Register Co.
NCTR,Non-Co-operative Target Recognition
NCW,Network Centric Warfare
Nd,Neodymium
ND,Non-Disclosure,North Dakota (postal symbol)
NDAA,U.S. National Defense Authorization Act
NDBP,Non-Departmental Public Body (Scotland)
NDCC,New Directions Counseling Center (Concord,California)
NDH,Neue Deutsche Härte (German,"new German hardness"—heavy metal genre),Nezavisna Država Hrvatska (Croatian,"Independent State of Croatia"—Nazi puppet state)
NDP,New Democratic Party (Canada)
NDS,Nintendo DS
NDU,National Defense University (Washington,DC)
NE,Nebraska (postal symbol),Niger (ISO 3166 digram),North-East
Ne,Neon
NEA,National Education Association (U.S. labor union),Near-Earth Asteroid,Nuclear Energy Agency (OECD)
NEAT-Near-Earth Asteroid Tracking,,National Emergency Access Target  (Au Health)
NEC,Network-enabled capability,Nijmegen Eendracht Combinatie (Dutch,"Nijmegen Unity Combination"; football club formed by the 1910 merger of the Nijmegen and Eendracht clubs),Nippon Electric Company,the original English-language name of the company now known as NEC,Northeast Conference (U.S. college sports)
NECTEC,National Electronics and Computer Technology Center (Thailand)
NED,Netherlands (IOC and FIFA trigram,but not ISO 3166)
NEI,National Eye Institute,Not Enough Information,Nuclear Energy Institute
NEMS,National Energy Modeling System (USDOE-EIA)
NEPA,National Environmental Policy Act
NER,Niger (ISO 3166 trigram)
NERICA,New Rice for Africa
NESDIS,National Environmental Satellite,Data and Information Service
NESP,NSA/CSS Enterprise Standards Program
NET,National Educational Television
NETCU,(UK) National Extremism Tactical Co-ordination Unit
NETL,(US) National Energy Technology Laboratory
NETWARS,Network Warfare Simulation
NEWS,Navy Electronic Warfare Simulator,North,East,West,South
NEX,Navy EXchange
nF,Nanofarad
NF,Norfolk Island (ISO 3166 digram)
NFA,(U.S.) National Firearms Act (often used to refer to the guns and accessories regulated under this law),No-Fire Area
NFC,National Football Conference,Near field communication
NFER,National Foundation for Educational Research
NFG,No Fucking Good
NFHS,National Federation of State High School Associations
NFI,Not F****** Interested
NFK,Norfolk Island (ISO 3166 trigram)
Nfld,Newfoundland
NFPA,National Fluid Power Association (United States)
NFT,No Further Text
NG,Natural Gas,Next Generation,Niger (FIPS 10-4 country code),Nigeria (ISO 3166 digram)
NGA,National Geospatial-Intelligence Agency,Nigeria (ISO 3166 trigram)
NGATS,New Generation Army Targetry System
NGH,Northern General Hospital
NGIC,National Ground Intelligence Center ("Injick")
NGO,non-governmental organization
NGR,Nigeria (IOC trigram,but not ISO 3166 or FIFA)
NGS,Naval Gunfire Support
nH,Nanohenry
NH,New Hampshire (postal symbol),New Hebrides (ISO 3166 digram; obsolete 1980),Vanuatu (FIPS 10-4 country code; from New Hebrides)
NHANES,National Health and Nutrition Examination Survey
NHB,New Hebrides (ISO 3166 trigram; obsolete 1980)
NHB,No Holds Barred radio (Link)
NHL,National Hockey League
NHO,Næringslivets Hovedorganisasjon (Confederation of Norwegian Enterprises,a Norwegian employers' organisation)
NHRA,National Hot Rod Association
NHS,National Health Service (UK)
NI,Nicaragua (ISO 3166 digram),Nigeria (FIPS 10-4 country code)
Ni,Nickel
NIAAA,U.S. National Institute on Alcohol Abuse and Alcoholism
NIAG,NATO Industrial Advisory Group
NIAID,National Institute of Allergies and Infectious Disease
NIAMD,National Institute of Arthritis and Musculoskeletal Diseases
NIB,New In Box (Internet auction/trading listings)
NIBP,Non-invasive blood pressure monitor
NIC,Network Interface Card,Nicaragua (ISO 3166 trigram)
NicA,Nicotine Anonymous
NICAP,National Investigations Committee on Aerial Phenomena
NICE,UK. National Institute for Health and Clinical Excellence
NICHD,National Institute of Child Health and Human Development [4]
NICP,National Inventory Control Point
NIDDK,National Institute of Diabetes and Digestive and Kidney Diseases
NIDRR,National Institute on Disability Research and Rehabilitation
NIEHS,National Institute of Environmental Health Sciences
NIG,Niger (IOC and FIFA trigram,but not ISO 3166)
NIH,National Institutes of Health,Not Invented Here
NIIN,National Item Identification Number
NIMA,National Imagery and Mapping Agency (became NGA)
NIMBY,Not In My Back Yard (See NOME)
NIMG,Not In My Generation
NIMH,National Institute of Medical Herbalists,National Institute of Mental Health
NiMH,nickel metal hydride ("Ni" is the chemical symbol for nickel)
NIN,Nine Inch Nails (band)
NIPR,National Institute of Polar Research (Japan)
NIR,Northern Ireland (FIFA trigram; not eligible for an ISO 3166 or IOC trigram)
NISAC,U.S. National Infrastructure Simulation and Analysis Center
NISCAP,NSA Information System Certification and Accreditation Program
NISER,National Institute of Science Education and Research
NIST, National Institute of Standards and Technology
NIT,National Invitation Tournament (U.S. college basketball),National Institutes of Technology (India)
NITFS,National Imagery Transmission Format Standard
NIU,Niue (ISO 3166 trigram)
nJ,Nanojoule
NJ,New Jersey (postal symbol)
NJHS,National Junior Honor Society
NJPW,New Japan Pro Wrestling
nK,Nanokelvin
NKA,No Known Allergies
NKVD,Narodnyi Komissariat Vnutrennikh Del (Russian "People's Commissariat of Internal Affairs") (1934-1954)
nL,Nanolitre
NL,Netherlands (ISO 3166 and FIPS 10-4 country code digram),Newfoundland and Labrador (postal symbol)
NLB,Non-Linear Battlefield
NLD,Netherlands (ISO 3166 trigram)
NLF,National Liberation Front (disambiguation)
NLL,National Lacrosse League
NLP,Natural Language Processing,Neuro-Linguistic Programming (pseudoscience)
NLW,Non-Lethal Weapon
nm,Nanometre
NM,New Mexico (postal symbol)
NMCI,Navy Marine Corps Intranet
NMCS,Not Mission Capable Supply (SM&R code)
NMD,U.S. National Missile Defense
NMHNFG,Not Made Here,No Fucking Good
NMN,No middle name
NMOS,N-type/Negative Metal-Oxide-Semiconductor transistor ("enn-moss")
NMR,Nuclear Magnetic Resonance
NMSG,NATO Modelling and Simulation Group
nN,Nanonewton
NNE,North North-East
NNSA,U.S. National Nuclear Security Administration
NNW,North North-West
NO,Nitric Oxide,Normally Open,Norway (ISO 3166 and FIPS 10-4 country code digram)
No,Nobelium
NOAA,U.S. National Oceanic and Atmospheric Administration
NOAF,Norwegian Air Force
NOAO,National Optical Astronomy Observatory
NOC,UK. National Oceanography Centre
NODEF,NATO Oceanographic Data Exchange Format
NOGI,New Orleans Grande Isle (award for diving)
NOLA,New Orleans,Louisiana (LA is the official postal code for Louisiana)
NOLF,Navy OutLying Field
NOM,Novus Ordo Missae or New Ordinary of the Mass (sometimes abbreviated to simply "NO")
NoMBO,Non-mine,Mine-like Bottom Object
NOME,Not on Mars Either
NOME,Not on Mars Either (see NIMBY)
NOPA,National Office Products Alliance,National Office Products Association
NOR,Norway (ISO 3166 trigram)
NORCECA,North,Central America and Caribbean Volleyball Confederation
NORELPREF,No religious preference
NORML,National Organization for the Reform of Marijuana Laws ("normal")
NORTHAG,Northern Army Group
NOS,Network Operating System,New Old Stock (Internet auction/trading listings),Nitric Oxide Synthase (enzyme)
NOSA,NATO OSI Security Architecture
NOTAFLOF,No One Turned Away For Lack Of Funds
NOW,National Organization for Women
NP,National Permit,A permit in India for trucks so they can go anywhere in the nation
Np,Neap tide (nautical charts),Neptunium
NP,Nepal (ISO 3166 and FIPS 10-4 country code digram)
NPB,Nippon Professional Baseball
NPC,National Postgraduate Committee,National Provincial Championship (New Zealand rugby competition,now defunct),Navigation Planning Chart,Non-Player Character (role-playing games)
NPCS,Non-Passenger Coaching stock (in Railways)
NPD,Nationaldemokratische Partei Deutschlands (German)
NPDI,New Product Development and Introduction
NPG,Needline/Network Participation Group
NPH,Normal Pressure Hydrocephalus
NPL,National Priorities List,Nepal (ISO 3166 trigram)
NPO,nothing by mouth
NPOV,Neutral Point Of View
NQ,Dronning Maud Land (ISO 3166 digram; obsolete 1983)
NQOCD,Not Quite Our Class,Dear (or Darling). (Upper-class English slang)
NR,Nauru (ISO 3166 and FIPS 10-4 country code digram)
NRA,National Rifle Association
NRAO,National Radio Astronomy Observatory
NRC,National Research Council (U.S.),Nuclear Regulatory Commission (U.S.)
NRDC,(U.S.) Natural Resources Defense Council
NREL,U.S. National Renewable Energy Laboratory
NRK,Norsk Rikskringkasting (Norwegian Broadcasting Corporation)
NRMP,National Resident Matching Program (U.S. medicine)
NRO,U.S. National Reconnaissance Office
NRT,Near Real Time
NRTA,National Rat Terrier Association,National Retail Tenants Association,National Retired Teachers Association,Northwest Regional Transmission Association
NRU,Nauru (ISO 3166 trigram)
ns,Nanosecond
nS,Nanosiemens
NS,Norfolk Southern Railway (AAR reporting mark),Nova Scotia (postal symbol),Suriname (FIPS 10-4 country code)
NSA,U.S. National Security Agency,Naval Support Activity,No Strings Attached
NSABB,National Science Advisory Board for Biosecurity
NSAID,Non-Steroidal Anti-Inflammatory Drug
NSB,Norges Statsbaner (Norwegian State Railways)
NSC,National Security Council
NSDAP,Nationalsozialistische Deutsche Arbeiterpartei (German: "German National Socialist Workers Party",the formal name of the Nazi Party)
NSDL,National Science Digital Library (US)
NSG,National System for Geospatial-Intelligence
NSN,National Stock Number
NSNA,National Student Nurses' Association
NSO,National Standardization Office (ABCA)
NSS,(U.S.) Naval Simulation System
NST,(UK) Nimrod Software Team
NSTAC,National Security Telecommunications Advisory Committee
NSV,Nikitin-Sokolov-Volkov heavy machine gun (Russian НСВ Никитина-Соколова-Волкова) ru:ПулеметНСВ-12,7 "Утес"
NSW,New South Wales (postal symbol)
nT,Nanotesla
NT,National Trust (UK),Saudi-Iraqi neutral zone (ISO 3166 digram; obsolete 1993),New Technology (Windows NT),Northern Territory (Australia) (postal symbol),Northwest Territories (Canada) (postal symbol)
NTC,National Training Center,Negative Temperature Coefficient (thermistor)
NTDS,Naval Tactical Data System
NTP,Network Time Protocol
NTR,Network Time Reference
NTRA,National Thoroughbred Racing Association
NTSB,National Transportation Safety Board
NTSC,National Television Standards Committee (colloquially,Never Twice the Same Color)
NTV,Non-Tactical Vehicle
NTY,(Internet Abbreviations:) Not Tested Yet; (Alternatively) No Thank You
NTZ,Iraq-Saudi Arabia Neutral Zone (ISO 3166 trigram; obsolete 1993)
NU,Nicaragua (FIPS 10-4 country code),Niue (ISO 3166 digram),Nunavut (postal symbol)
NUI,No user interface ("noo-ey")
NUL,Null character (ASCII code of control character),National Urban League
NUTS,Nuclear Utilization Target Selection
NUWC,U.S. Naval Undersea Warfare Center
NV,Naamloze vennootschap (Dutch,"innominate partnership" or "anonymous venture"; i.e. a public limited-liability company),Nevada (postal symbol)
nV,Nanovolt
NVEOL,Night Vision and Electro-Optics Laboratory
NVESD,CERDEC Night Vision and Electronic Sensors Directorate,Fort Belvoir,Virginia
NVG,Night Vision Goggles
NVL,Night Vision Laboratory
nW,Nanowatt
NW,North-West
NW,Nuclear Weapon
NWA,National Wrestling Alliance
NWF,National Wildlife Federation
NWFZ,Nuclear-Weapon-Free Zone
NWHN,U.S. National Women's Health Network
nWo,New World Order (see article for explanation of idiosyncratic capitalization)
NWOAHM,New Wave of American Heavy Metal
NWOBHM,New Wave of British Heavy Metal (sometimes pronounced /n.ˈwɒbm/ as if it were an acronym)
NWRA,National Wildlife Rehabilitators Association
NWSL,National Women's Soccer League (U.S.)
NWT,North-West Territories
NX,Part of computer memory marked as "no execute",Automobile made by Nissan,unit of illuminance,National Express,Net exports
NXA,21st arcade game in the Pump It Up series
NXD,Native XML
NXE,New Xbox Experience
NXG,New Cross Gate station
NXL,National XBall League
NXN,Nike Cross Nationals
NXP,"Next Experience" Semiconductors
NY,New York (postal symbol)
NYC,New York City
NYHA,New York Heart Association
NYO,National Youth Orchestra of Great Britain
NYRA,National Youth Rights Association,New York Racing Association (horse racing)
NYSE,New York Stock Exchange
NZ,New Zealand (ISO 3166 and FIPS 10-4 country code digram)
NZC,New Zealand Cricket
NZL,New Zealand (ISO 3166 trigram)
NzL,Noze looan (online/event listings)
NZOSS,New Zealand Open Source Society
NZRU,New Zealand Rugby Union
O,Oberst,Observer,Obstacle,Octal,Officer,Official,Oh,Operational,Operator,Oprah (magazine),Outstanding,Oxygen
OA,Operational Analysis,Overeaters Anonymous
OAC,On Approved Credit
OAP,Old Age Pensioner (UK)
OARSI,Osteoarthritis Research Society International
OAS,Organization of American States
OASIS,Objects and Agents for Information Systems and Simulation,Organization for the Advancement of Structured Information Standards
OASIS,Ontario Agencies Supporting Individuals with Special Needs
OASIS,Ontario Association of Sewage Industry Services
OASP,Operational Analysis Support Paper/Plan
OAU,Organization for African Unity
OB,Obedience,Obligation,Obligatory,Obsolete,Obstetrics,Ocean Beach (California),Off Break (cricket),Old Bryanstonian,Order of Battle,Outlet Box (electrical),Overbought (stock market),Oversight Board
ob,obiit (Latin," he died")
OBE,Officer of the Order of the British Empire
OBS,Observation/Observer,Obsolete,Obstacle,Off Balance Sheet,Optical Burst Switching (IEEE),Organic Brain Syndrome,Organization(al) Breakdown Structure
OBSS,Off Board Sensor Systems,Ordo Byantinus Sancti Sepulchri (Byzantine Order of the Holy Sepulchre),Orbiter Boom Sensor System (space shuttle),Origins Billion Star Survey
OBX,Outer Banks (North Carolina)
OC,Officer Commanding
OCA,Observatoire de la Côte d'Azur,Offensive Counter-Air
OCD,Obsessive-Compulsive Disorder
OCFS,Oracle Cluster File System
OCFS2,Oracle Cluster File System Release 2
OCMCC,[2] Orchard County MCC
OCN,Oncology Certified Nurse
OCO,Oort Cloud Object
OCOKA,Observation,Cover and concealment,Obstacles,Key terrain,and Avenues of approach (mnemonic)
OCR,Optical Character Recognition
OCS,see entry
OD,Old Dragon,Ordnance Datum (nautical charts),Overdose
ODAS,OCA-DLR Asteroid Survey
ODB,Ol' Dirty Bastard (rapper),One Dirty B*tch/Broad/Babe (professional wrestler),Operational Data Base,Original David Baker (professional poker player; used to distinguish from another professional poker player of the same name),Oxford Dictionary of Byzantium
ODBC,Open DataBase Connectivity
ODI,Office for Disability Issues (UK government agency),One Day International (cricket),Open Data-Link Interface,Oracle Data Integrator,Overseas Development Institute (UK think tank),OE[edit]
OEA,(U.S.) Office of Economic Adjustment
OECD,Organisation for Economic Co-operation and Development (international)
OED,Oxford English Dictionary
OEG,Operation Exposure Guidance
OEIS,On-Line Encyclopedia of Integer Sequences
OEM,Original Equipment Manufacturer
OFA,Occipital Face Area
OFDA,U.S Agency for International Development's Office of Foreign Disaster Assistance
OGC,Open Geospatial Consortium
OGD,Other Government Department
OGO,Other Government Organization
OGX,OUARGLA,a petroleum state in the south of Algeria
OH,Ohio (postal symbol)
OHC,OverHead-Cam engine
OHHLA,Original Hip-Hop Lyrics Archive
OHIP,Ontario Health Insurance Plan
OHMS,On Her (or His) Majesty's Service (also written: O.H.M.S.)
OHP,Observatoire de Haute-Provence
OHSS,Ovarian Hyperstimulation Syndrome
OIC,Officer In Charge
OIE,World Organisation for Animal Health (originally the Office international des épizooties,French for "International Epizootic Office")
OIF,Operation Iraqi Freedom
OIOC,Oriental & India Office Collections (in the British Library)
OJ,Orange Juice,O.J. Simpson
OJT,On-the-Job Training
OK,Oklahoma (postal symbol),oll korrect (facetious alteration of "all correct",1839)
OKC,Oklahoma City
OLED,Organic Light-Emitting Diode
OLS,Operational Linescan System
OM,Oman (ISO 3166 digram),Olympique de Marseille (French football club)
OMA,Open Mobile Alliance,Operations & Maintenance,Army
OMB,U.S. Office of Management and Budget,Ontario Municipal Board,Order of Mapungubwe in Bronze
OMD,Orchestral Manoeuvres in the Dark (1980s pop group)
OME,Osaka Mercantile Exchange
OMFG,Oh My Fucking God
OMG,Oh My God or Or My Gosh
OMGW,"Oh My Gosh it's Windy"
OMN,Oman (ISO 3166 trigram)
OMNCS,U.S. Office of the Manager for the National Communications System
OMP,Order of Mapungubwe in Platinum
OMS,Order of Mapungubwe in Silver
OMT,Object Model Template
OMW,On My Way,Oh My Word
ON,Ontario (postal symbol)
ONC,Orthopaedic Nurse Certified
ONCE,Organización Nacional de Ciegos Españoles (Spanish,"National Organization for the Spanish Blind")
ONG,Orthodontic National Group
ONH,Óglaigh na hÉireann (Irish idiom for "soldiers of Ireland"),used for the following:
ONI,(U.S.) Office of Naval Intelligence
Onna,Oniong,Nnung Ndem,and Awa,a Local Government Area in Nigeria
ONS,Operational Needs Statement
OO,Object Oriented,Over & Out
OOAD,Object Oriented Analysis and Design
OOBE,Out-of-body experience
OOCL,Orient Overseas Container Line
OODA,Observation,Orientation,Decision,Action loop (a.k.a. Boyd's Loop)
OOMF,One Of My Followers
OOO,Out Of the Office
OOP,Object-Oriented Programming,Out Of Print
OOS,Occupational Overuse Syndrome,OneSAF Objective System,Open Operating System,Out Of Service
OOTW,Operations Other Than War
OP,Observation Point/Post,Ocean Pacific (surfwear and swimwear brand),Original Poster (internet),Order Point,in inventory management; the inventory state at which more items should be ordered. Often expressed as a part of OP/OQ (when quantity OP is reached,order OQ new items),Overpowered,often used to refer to fictional characters (e.g. Superman) or game mechanics (e.g. the Black Lotus in Magic: the Gathering) that are considered disproportionately strong
OPA,Other Procurement,Army
OPAC,Online Public Access Catalogue
OPCON,Operational control
OPCW,Organisation for the Prohibition of Chemical Weapons
OPEC,Organization of the Petroleum Exporting Countries
OPFOR,Opposing force
OPI,Office of Primary Interest,Open Prepress Interface
OPINTEL,Operational Intelligence
OPLAN,Operation plan (also OpPlan)
OPORD,Operation order
OPP,Ontario Provincial Police,Operational Planning Process,Other People's Property/Pussy/Penis (song)
OPS,On-base plus slugging (baseball statistics),Operations
OPSEC,Operations security,Open Platform for Security
OPSI,Overwhelming post splenectomy infection,UK Office of Public Sector Information
OPTAR,Operational target
OPV,Offshore Patrol Vessel
OQ,Order Quantity,in inventory management; the quantity of new items to be ordered. Often expressed as a part of OP/OQ (when quantity OP is reached,order OQ new items)
OR,Operating Room (surgery),Operational/Operations Research,Oregon (postal symbol),overreciprocation,when the leader of an inner circle friendship contacts a friend more than is wanted or reasonable
ORAU, Oak Ridge Associated Universities
ORB, Object Request Broker
ORBAT,Order of Battle
ORD,Office of Research and Development,Operational Requirements Document
ORF,Operational iness Float
ORISE,Oak Ridge Institute for Science and Education
ORNL,Oak Ridge National Laboratory
ORR,Oak Ridge Reservation (U.S. DOE),Office of Rail Regulation (UK government),Office of Refugee Resettlement,(CIA) Office of Research and Reports,Operational iness Rate,Operational iness Review
ORSA,Oxacillin-resistant Staphylococcus aureus,Operations Research Society of America
OS,Operating System
Os,Osmium
OSA,Order of St. Augustine
OSCE,Organisation for Security and Cooperation in Europe
OSD,U.S. Office of the Secretary of Defense,On-screen Display
OSDL,Open Source Development Labs
OSE,Own Separate Entrance
OSERS,U.S. Department of Education Office of Special Education and Rehabilitative Services
OSETI,Optical SETI also Optical SETI
OSHA,Occupational Safety and Health Administration
OSI,Office of Strategic Influence,Ontario Swine Improvement,Open Source Initiative,Open Systems Interconnection
OSIA,(U.S.) On-Site Inspection Agency
OSIRIS,Optical,Spectroscopic,and Infrared Remote Imaging System (astronomical system on the Rosetta spacecraft),Optical System for Imaging and low Resolution Integrated Spectroscopy (astronomical system on the land-based Gran Telescopio Canarias)
OSL,Open Source License,Optically Stimulated Luminescence,Orbiting Solar Laboratory
OSM,One Saturday Morning
OSOTPBOIAS,One Sec,On The Phone,Be Off In A Sec
OSPA,Operations Security Professional's Association site of OSPA
OSPA,Oregon School Psychologists Association [3]
OSRH,Oružane Snage Republike Hrvatske (en: Armed forces of the Republic of Croatia)
OSS,Office of Strategic Services (1942-1945,forerunner of CIA)
OSU,Ohio State University,Oklahoma State University
OTA,Office of Technology Assessment, Orthodontic Technicians Association
OTAC,Orthodontic Technicians Association Conference,Orthodontic Technicians Association Council
OTB,Off The Ball,Offtrack Betting,OneSAF Testbed (a descendant of ModSAF)
OTC,Over-The-Counter (drugs)
OTD,Off the derech (referring to an Orthodox Jew who has stopped practicing the tenets of his or her faith)
OTEA,(U.S. Army) Operational Test Evaluation Agency
OTI,Office of Transition Initiatives (United States Agency for International Development)
OTO,Ordo Templi Orientis (Latin,"Order of the Temple of the East",i.e. the Order of Oriental Templars)
OTOH,On The Other Hand
OTS,Off the scale,sexually untouchable except for a lot of money.
OTSBH,Over The Shoulder Boulder Holder
OTW,On The Way
OTYBL,Over To You Blue Leader
OTYRL,Over To You Red Leader
OU,University of Oklahoma
OVC,Overcast (METAR Code),Ohio Valley Conference
OVV,Optically Visually Violent,or Optically Violently Variable,a type of quasar
OW,Old Wykehamist
OWN,Oprah Winfrey Network
OX,IATA code for Orient Thai Airlines
OXC,Optical cross-connect
OXM,Official Xbox Magazine
OXT,Oxytocin
Oy,Osakeyhtiö (Finnish,"stock company")
Oyj,Julkinen osakeyhtiö (Finnish,"public stock company")
OZ,(?) Australia
P,Peta,Phosphorus
p,pico
P2P,Peer-to-peer (networking)
Pa,pascal,Protactinium
pA,picoampere
PA- Pamela Anderson,Panama (ISO 3166 digram),Paraguay (FIPS 10-4 country code),Partial Agonist,Pennsylvania (postal symbol),petampere,PolyAmide (Nylon),Prince Albert piercing,Public Address (vocal amplification system),Public Affairs,PA 6,Nylon 6 (PolyAmide) (similarly for PA 11,12,46,66,610)
PAA,Position Area for Artillery
PABX,Private Automated Branch eXchange (company phone system)
PAC,Pan Africanist Congress,Partial Solar Calibrator,Patriot Advanced Capabilities,Political action committee, Primary Auditory Cortex
PACOM,(U.S.) Pacific Command
PADD,Personal Access Display Device (as seen in the Star Trek franchise),Petroleum Administration for Defense Districts,used for data collection in the U.S. petroleum industry
PADI,Professional Association of Diving Instructors
PAEK,PolyArylEtherKetone
PAFC,Plymouth Argyle Football Club
PAH,Polycyclic aromatic hydrocarbon
PAHO,Pan American Health Organization
PAI,PolyAmide Imide,Pre-Approval Inspection (pharma)
PAK,Pakistan (ISO 3166 trigram)
Pakistan,Punjab,Afghan states,Kashmir,sIndh,baluchiSTAN
PAL,Phase Alternating Line (TV standard),Philippine Airlines
PAM, Precision Attack Missile
PAMELA,Payload for Antimatter Matter Exploration and Light-nuclei Astrophysics,Pedestrian Accessibility and Movement Environment Laboratory
Pamida,Patrick,Michael,and David,sons of the department store chain's co-founder Jim Witherspoon
PAN,Panama (ISO 3166 trigram),Partai Amanat Nasional (Indonesian,"National Mandate Party"),Indonesian political party,Partido Acción Nacional (Spanish,"National Action Party"),political parties in El Salvador,Mexico,and Nicaragua,Partido de Avanzada Nacional (Spanish,"National Advancement Party"),Guatemalan political party,Personal Area Network,PolyAcryloNitrile,Programa de Asistencia Nutricional (Spanish,"Nutritional Assistance Program"),U.S. federal program for nutritional needs of poor families in Puerto Rico
PANS,Pretty Advanced/Awesome Network Services (cf. POTS)
PAO,Panathinaikos Athlitikos Omilos (Greek: Παναθηναϊκός Αθλητικός Όμιλος,"Pan-Athenian Athletic Club"),Public Affairs Officer
PAOK,Panthessalonikeios Athlitikós Ómilos Konstantinoupoliton (Greek Πανθεσσαλονίκειος Αθλητικός Όμιλος Κωνσταντινοπολιτών,"Pan-Thessalonian Athletic Club of Constantinopolites")
PAR,Paraguay (IOC and FIFA trigram,but not ISO 3166)
PARC,Palo Alto Research Center
PAROS,Prevention of an Arms Race in Outer Space (treaty)
PARP,(NATO Partnership for Peace) Planning And Review Process
PARWIG,Power Augmented Ram Wing In Ground (aeroplane wing shape)
PAS,See entry
PASA,PolyAmide,Semi-Aromatic (Nylon)
PASGT,Personnel Armor System,Ground Troops
PASR,Personnel Accounting and Strength Reporting
PATH,Port Authority Trans-Hudson
PAWS,Phased Array Warning System,Progressive Animal Welfare Society
PAYD,Pay As You Drive
PAYE,Pay As You Earn
Pb,Lead (Latin Plumbum)
PB,PolyButylene
PBA,Philippine Basketball Association,Professional Bowlers Association
PBB,PolyBrominated Biphenyl
PBCK,Problem Between Chair and Keyboard (computer help desk in-joke)
PBD,PolyButaDiene
PBDE,PolyBrominated Diphenyl Ether
PBI,PolyBenzImidazole
PBN,PolyButylene Naphthalate
PBOH,Please Become Old History
PBR,Pabst Blue Ribbon (beer brand),Professional Bull Riders
PBRT,may stand for: Physically Based Raytracing,an open source software rendering system for physically correct image synthesis.
PBS,Pharmaceutical Benefits Scheme (Australia),Public Broadcasting Service (U.S.),Public Broadcasting Services (Malta)
PBT,PolyButylene Terephthalate
PBX,Private Branch eXchange (company phone system)
PC,petacoulomb,U.S. Pacific Islands Trust Territory (ISO 3166 digram; obsolete 1986),Personal computer,Player Character (roleplaying),Politically Correct / Political Correctness,post cibum (Latin,"after meals")
pC,picocoulomb
PCAS,Planet-Crossing Asteroid Survey
PCB,see entry
PCC,NATO Partnership Coordination Cell,Posterior Cingulate Cortex,Pre-Command Course,Presidents Conference Committee
PCCB,Porsche Ceramic Composite Brake
PCCIP,President's Commission on Critical Infrastructure Protection
PCE,PerChlorEthylene
PCI,U.S. Pacific Islands Trust Territory (ISO 3166 trigram; obsolete 1986),Peripheral Component Interconnect (computer bus)
PCIe,Peripheral Component Interconnect Express (computer bus)
PCL,Passive Coherent Location
PCMCIA,Personal Computer Memory Card International Association (People Can't Memorise Computer-Industry Acronyms)
PCN,Pitcairn Islands (ISO 3166 trigram)
PCP,phencyclidine,Pneumocystis jiroveci pneumonia (formerly Pneumocystis carinii),Probabilistically Checkable Proof
PCPI,Physician Consortium for Performance Improvement (AMA)
PCR,Polymerase chain reaction
PCSSD,Pulaski County Special School District
PCT,Pacific Crest Trail,Patent Cooperation Treaty
PCTE,Portable Common Tool Environment,Punjab College of Technical Education
PCZ,Panama Canal Zone (ISO 3166 trigram; obsolete 1980)
Pd,Palladium
PD,per diem (Latin: (calculated) by the day),Point of Departure,Police Department,Postal District,Potential Difference,Principal Deputy,Public Domain,Privatdozent
PD,Product Director—Example: CERDEC Product Director C4ISR and Network Modernization
PDA,Personal Digital Assistant,Predicted Drift Angle,Public Display of Affection,Push-Down Automaton
PDD,Past Due Date,Presidential Decision Directive
PDF,Panama[nian] Defense Forces (abolished 1990),Portable Document Format,Principal Direction of Fire
PDG,President Director General,Product Development Group
PDL,Pure Dumb Luck (Texan punk band)
PDN,Pull-Down Network
PDP,Programmable Data Processor,Performance Development Plan
PDQ,Pre-Defined Queries (Siebel packages),Pretty Damn Quick
PDRY,People's Democratic Republic of Yemen (obsolete since 1990)
PDT,Pacific Daylight [Saving] Time (UTC-7 hours)
PDU,Police Dog Unit,Power Distribution Unit,Protocol Data Unit
PE,Ice Pellets (old style METAR Code),Peru (ISO 3166 and FIPS 10-4 country code digram),Physical Education,Premature Ejaculation,Prince Edward Island (postal code),Price to Earning ratio (used for equity shares),Plant Extract
PE,Professional Engineer
PEBCAC,Problem Exists Between Chair and Computer (IT help desk in-joke)
PEBKAC,Problem Exists Between Keyboard and Chair (ditto)
PEEK,PolyEtherEtherKetone
PEET,Partnerships for Enhancing Expertise in Taxonomy
PEGIDA,Patriotische Europäer gegen die Islamisierung des Abendlandes (German,"Patriotic Europeans Against the Islamization of the West")
PEI,Prince Edward Island,PolyEtherImide
PEK,PolyEtherKetone
PEO,Παγκύπρια Εργατική Ομοσπονδία (Greek for "Pancyprian Federation of Labour"),Philanthropic Educational Organization,PolyEthylene Oxide,Professional Employer Organization,Professional Engineers Ontario
PEPFAR,President's Emergency Plan For AIDS Relief
PER,Peru (ISO 3166 trigram)
perl,usually lower case Practical Extraction and Report Language
PES,PolyEtherSulfone
PEST,UK Public Engagement with Science and Technology
PET, Personal Electronic Transactor,Pierre Elliott Trudeau,Positron Emission Tomography (as in PET scan),PolyEthylene Terephthalate (plastic),Preliminary English Test
PETA, pentaerythritol triacrylate,People Eating Tasty Animals,People for the Ethical Treatment of Animals
petawatt-
PETE,PolyEthyleneTErephthalate
PETP,PolyEthyleneTerePhthalate
PF,French Polynesia (ISO 3166 digram),petafarad,Phenol Formaldehyde (resin),Power forward,a player position in Australian rules football,basketball,and ice hockey
pF,picofarad
PFD,Permanent Fund Dividend = personal flotation device
PFE,Permanent Forest Estate
PFIY,Please Fix it Yourself ("pee-fiy")
PFLAG,Parents,Families and Friends of Lesbians and Gays ("pee-flag")
PFO,Pissed,Fell Over (medical diagnosis in-joke)
PfP,Partnership for Peace
PG -
Pg,petagram
pg,picogram
PGCE,Postgraduate Certificate in Education
PGD,Pre-implantation Genetic Diagnosis
PGENI,Pharmaco-Genetics for Every Nation Initiative
PGH,Pre-implantation Genetic Haplotyping
PGM,Precision-Guided Munition
PGP,Pretty Good Privacy
pH,parts of hydrogen (acidity/alkalinity index),picohenry
PH,Passive Homing (missile guidance system),petahenry,Philippines (ISO 3166 digram),Probability of Hit,Public Health,Purple Heart
PHA,PolyHydroxyAlkanoate,Potentially Hazardous Asteroid
PHL,Philippines (ISO 3166 trigram)
PHQ,Patient Health Questionnaire
Pi,Pebi
PI,PolyImide,PolyIsoprene,Private Investigator
PIB,PolyIsoButylene
PIC,Person In Charge
PICNIC,Problem In Chair Not In Computer
PICS,Private Investment Capital Subscription
PID,Pelvic Inflammatory Disease,Plan Identification Number,Positive Identification,Procedural Identification,Procurement Identification Description
PIF, Partners in Flight
PIG,Pipeline Inspection Gauge
PIM, Parameterized Ionospheric Model,Path of Intended Motion,Pediatric Index of Mortality,Personal Information Manager/Management,Presence and Interworking Mobility,Processor-In-Memory,Program Integration Manager,Protocol Independent Multicast
PIN,Personal Identification Number
PINF,People In Need Foundation (Czech charitable organisation)
PIPA, Program on International Policy Attitudes
PIR,Priority Intelligence Requirement
PIRA,Provisional Irish Republican Army
PIREPS,Pilot Reports
PITA,Pain In The Ass
PJ,petajoule
pJ,picojoule
PJHQ,Permanent Joint Headquarters
PJs,Pajamas ("pee-jayz")
PK,Pakistan (ISO 3166 and FIPS 10-4 country code digram),petakelvin,Player Kill[er],Probability of Kill,PolyKetone,Pulemet Kalashnikova (Russian ПК пулемет Калашникова,"Machinegun Kalashnikov")[1]
PKA,Previously Known As,Professionally Known As
PKE,Partnership of Kindermusik Educators [1] &[2] & [2]
PKI,Public Key Infrastructure (cryptography)
PKM,Pulemet Kalashnikova Modernizirovanniy (Russian ПКМ пулемет Калашникова модернизированный,"Machinegun Kalashnikov Modernised")[1]
PKMS,Pulemet Kalashnikova Modernizirovanniy Stepanova (Russian ПКМС пулемет Калашникова модернизированный Степанова,"Machinegun Kalashnikov Modernised Stepanova")[1]
PKMT,Pulemet Kalashnikova Modernizirovanniy Tankoviy (Russian ПКМТ пулемет Калашникова модернизированный танковый,"Machinegun Kalashnikov Modernised Tank") (a.k.a. PKTM[1])
PKT,Pulemet Kalashnikova Tankoviy (Russian ПКТ пулемет Калашникова танковый,"Machinegun Kalashnikov Tank")[1]
PKTM,Pulemet Kalashnikova Tankoviy Modernizirovanniy (Russian ПКТМ пулемет Калашникова танковый модернизированный,"Machinegun Kalashnikov Tank Modernised") (a.k.a. PKMT)[1]
PKU,Phenylketonuria
PL,Ice Pellets (new style METAR Code),petalitre,Phase Line (Co-ordination Line),Poland (ISO 3166 and FIPS 10-4 country code digram)
pL,picolitre
PLAF, People's Liberation Armed Forces,Pluggable look and feel,Product Line Architecture Framework
PLAID,Precision Location and Identification
PLB,Personal Locator Beacon
PLC,Public Limited Company (British)
PLCC,Plastic Leaded Chip Carrier (electronics)
PLD,Probable Line of Deployment
PLEBS,People Lacking Everyday Basic Skills
PLF,Parachute Landing Fall
PLGR,Precision Lightweight GPS Receiver ("plugger")
PLI,Position Location Information,Private Lands Initiative,Professional Liability Insurance
PLIF,Planar Laser-Induced Fluorescence
PLK,Polska Liga Koszykówki (Polish,"Polish Basketball League")
PLKK,Polska Liga Koszykówki Kobiet (Polish,"Polish Women's Basketball League")
PLL,Phase-Locked Loop (electronics)
PLM,Polarized Light Microscope/Microscopy
PLMBA,Phospholipid Bilayer Microarray
Pln,Platoon
PLO,Palestine Liberation Organization
PLOKTA,Press Lots Of Keys To Abort
PLP,Platonic Life Partner
PLS,Palletized Loading System,Personal Locator System
PLUTO,Pipe Line Under The Ocean
PLW,Palau (ISO 3166 trigram)
PM,Panama (FIPS 10-4 country code),Perry Mason,Phase Modulation,Post Meridiem (Latin "after noon"),Prime Minister,Project Manager,Saint Pierre and Miquelon (ISO 3166 digram)
Pm,petametre,Promethium
pm,picometre
PMC,Primary Motor Cortex
PMI,Positive Material Identification
PMID,PubMed Identifier
PMMA,PolyMethylMethAcrylate
PMOS,P-type/Positive Metal-Oxide-Semiconductor transistor ("pee-moss")
PMS,Premenstrual Syndrome
PMSL,Piss Myself Laughing (Internet shorthand)
PMT,Premenstrual Tension (UK) (see Premenstrual Syndrome)
PN,petanewton,Pitcairn Islands (ISO 3166 diagram)
pN,piconewton
PNAC,Project for the New American Century
PNC,Palestinian National Council,Palmerston North City (cf. PNC,a New Zealand rapper from this city),Pittsburgh National Corporation,one of the two companies that merged into today's PNC Financial Services,Provident National Corporation,the other company that merged into PNC Financial Services
PNG,Papua New Guinea (ISO 3166 trigram),Portable Network Graphics
PNH,Paroxysmal nocturnal hemoglobinuria,Police Nationale d'Haïti (French,"National Police of Haiti"),PO[edit]
PNP,Partido Nuevo Progresista,Plug 'N' Play/Pray,Positive Negative Positive
PNVS,Pilot Night Vision Sensor
PO,Dust Devil (METAR Code),per os (Latin,"by mouth"),Portugal (FIPS 10-4 country code)
Po,Polonium
PO,Post Office
PO,Purchase Order
POCD,Post-Operative Cognitive Dysfunction
POD,Payable on Death (banking term,and the full name of American metal band P.O.D.),Point of divergence (alternate or counterfactual history),Port of Debarkation
pod,Plain Old Documentation
POE,Perl Object Environment,(b) Port Of Embarkation (c) Polyol Ester (d) Power Over Ethernet
POETS,Portable Occultation,Eclipse,and Transit electronic-camera System
POFF,Plain Old Flat File
POG,Passionfruit,Orange and Guava
POGO,Project On Government Oversight
POI,Program Of Instruction
POK, Plane Of Knowledge
POL,Petroleum,Oils and Lubricants,Poland (ISO 3166 trigram)
POLAD,Political Advice
POM,Program Objective Memorandum,PolyOxyMethylene
POMDP,Partially observable Markov decision process
PooS,Poo Sniffer (Internet shorthand)
POP- Point of Presence,Post Office Protocol,Progesterone Only Pill
POR,Portugal (FIFA and IOC trigram,but not ISO 3166),Proposed Operational Requirement
POS- Point Of Sale terminal (retail industry transaction computers),Piece Of S**t
POSH,Port Outbound Starboard Home (alleged)
POSSLQ,Person of the Opposite Sex Sharing Living Quarters
POT, Plane Of Tranquility
POTS,Plain Old Telephone Service (cf. PANS),Postural Orthostatic Tachycardia Syndrome
POV,Point of view
POW,Prisoner of war
PP,Papua New Guinea (FIPS 10-4 country code),Passage Point,per procurationem (Latin,"by proxy")
pp-pages,especially in references,e.g. "A. U. Thor,Title,Journal X,Vol. 1,no. 2 (2010) pp. 13-42."
PPA,Parahippocampal Place Area,PolyPhthalAmide
PPASC,(U.S.) Plans and Program Analysis Support Center
PPASSCCATAG,"Proud Parents Against Singles,Seniors,Childless Couples And Teens And Gays",a fictional group formed by Marge Simpson
PPCLI,Princess Patricia's Canadian Light Infantry (regiment)
PPG,Pittsburgh Plate Glass (the original name of the company now known as PPG Industries),The Powerpuff Girls
PPL,Pakistan Petroleum Limited,Pay per lead (marketing),Pennsylvania Power and Light,former name of the U.S. utility company now known as PPL,Pfadfinder und Pfadfinderinnen Liechtensteins (German,"Scouts and Guides of Liechtenstein"),Phonographic Performance Limited (UK performing rights organisation)
PPLI,Precise Participant Location & Identification
ppm,Parts Per Million
PPM,Parts Per Million
PPM,Project Planning and Management
PPO,PolyPhenylene Oxide
PPP,Point-to-Point Protocol,Purchasing Power Parity
PPQ,Pulses Per Quarter (used in music programming,sequencers)
PPQN,Pulses Per Quarter Note (ditto)
PPQT,Pre-Production Qualification Test
PPS,post postscriptum,Precise/Precision Positioning Service (GPS),PolyPhenylene Sulfide
PPV,Pay-per-view
PQ,Province of Québec (obsolete postal code,replaced by QC),Parti Québécois,PR[edit]
Pr,Pastor or Priest
Pr,Praseodymium
PR,Public Relations,Puerto Rico (postal symbol; ISO 3166 digram)
Prb,Presbyter
PRBO,Point Reyes Bird Observatory
PRC,People's Republic of China
PRD,CERDEC Product Realization Directorate
PRFG,Partial Fog (METAR Code)
PRI,Puerto Rico (ISO 3166 trigram)
PRK,Democratic People's Republic of Korea (ISO 3166 trigram)
PRM,Personnel iness Management
PRN,pro re nata (Latin,"for the emergency","as needed")
PRT,Portugal (ISO 3166 trigram),Provincial Reconstruction Team
PRY,Paraguay (ISO 3166 trigram)
PS,Palestinian Territory,Occupied (ISO 3166 digram),Personnel Services,petasiemens,post scriptum (Latin,"written after"),Power Steering,Power Supply,Public School
Ps,petasecond
pS,picosiemens
PSA,Paralysis Society of America,Pharmaceutical Society of Australia,Pressure-Sensitive Adhesive,Production Services Association,Prostate Specific Antigen,Public Service Announcement,Public Service Association
PSC,Personal service corporation,Primary Somatosensory Cortex
PSE,Palestinian Territory,Occupied (ISO 3166 trigram)
PSG,Pacific Seabird Group
PSI, Portable Source Initiative
PSI,Pounds per square inch
PSO,Peace Support Operations,Primary Standardisation Office (ABCA),Protocol Supporting Organization (of the ICANN)
PSS,Personnel System Support
PST,Pacific Standard Time (UTC-8 hours)
PSU,Pennsylvania State University
PSV,Philips Sport Vereniging (Dutch for "Philips Sports Union"),Public Service Vehicle
PsyOp,Psychological Operations
PT,petatesla,Physical Training (in the Army),Portugal (ISO 3166 digram)
pT,picotesla
Pt,Platinum
PTA,Parent-Teacher Association
PTAL,Public Transport Accessibility Level
PTAN -
PTES,People's Trust for Endangered Species
PTFE,PolyTetraFluoroEthylene
PTI,Pardon the Interruption
PTL,Patrol,Primary Target Line
PTO,Patent and Trademark Office,Please Turn Over
PTSD,Post-Traumatic Stress Disorder
PTUI, Plain-Text User Interface ("pa-too-ey") (cf CLI)
PU,Guinea-Bissau (FIPS 10-4 country code),Polyurethane,United States Miscellaneous Pacific Islands (ISO 3166 digram; obsolete 1986)
Pu,Plutonium
Pub,Publication
PUG, PET Users Group
PUN, Pull-Up Network
PUP, Pull-Up Point
PUR,Puerto Rico (IOC and FIFA trigram,but not ISO 3166)
PUS,United States Miscellaneous Pacific Islands (ISO 3166 trigram; obsolete 1986)
PV,petavolt
pV,picovolt
PVC,Permanent Virtual Circuit,PolyVinyl Chloride,Premature Ventricular Contraction,Primary Visual Cortex
PvE,Player versus Environment
PvP,Player versus Player
PVR,Personal Video Recorder
PvZ,Plants vs. Zombies
PW,Palau (postal symbol; ISO 3166 digram)
pW,picowatt
PWA,Pirates With Attitude
PWBA,Pension and Welfare Benefits Administration
PWC,PieceWise Constant (describing a mathematical function)
PwC,PricewaterhouseCoopers (international accounting firm)
PWL,PieceWise Linear (describing a mathematical function)
PWLC,PieceWise Linear and Concave/Convex (describing a mathematical function)
PWP,Plot,What Plot? / Porn Without Plot (denotes plotless,um,"feel-good" stories in online fiction,especially fanfic or erotic fiction)
PWR,Pressurized Water Reactor
PWV,Pretoria-Witwatersrand-Vereeniging,the original name for the South African province now known as Gauteng,and still used to refer to the metropolitan agglomeration at the core of the province
PX,Post eXchange
PY,Paraguay (ISO 3166 digram),Person-Year,Portsmouth yardstick
PYF,French Polynesia (ISO 3166 trigram)
PYMWYMI,Put Your Money Where Your Mouth Is
PZ,Panama Canal Zone (ISO 3166 digram; obsolete 1980),Pickup Zone
Q1,First Quarter
Q2,Second Quarter
Q3,Third Quarter
Q4,Fourth Quarter
QA,Qatar (FIPS 10-4 country code; ISO 3166 digram)
Qantas,Queensland And Northern Territory Aerial Services
QAP,Quadripartite Advisory Publication ("kwapp")
QAT,Qatar (ISO 3166 trigram)
QB,Quarterback (football)
QC,Quality Control,Québec (postal symbol),Queen's Counsel
QCA,Qualifications and Curriculum Authority,Quality Council of Alberta
QCD,Quantum ChromoDynamics
QD,quaque die (Latin,"daily")
QDOS,Quick and Dirty Operating System ("cue-doss")
QDR,Quadrennial Defense Review
QDRO,Qualified domestic relations order ("quad-ro")
QED,quantum electrodynamics,quid es demonstrata or quod erat demonstrandum (Latin,"that proves it" or "which was to be demonstrated")
QEH,Queen Elizabeth's Hospital
QFE,Quoted For Emphasis,Local ground level atmospheric pressure (aeronautical Q code)
QID,quater in die (Latin,"four times daily")
QIP,Quadrilateral Interoperability Programme (ancestor of MIP; "quip")
QK,Air Canada Jazz (IATA airline designator)
QLD,Queensland,(Australia) (postal symbol)
QM,Quality Management,Quantum Mechanics,Queen Mother
QNH,Regional mean sea level atmospheric pressure (aeronautical Q code)
QPR,Queens Park Rangers F.C. (English football team),Quality-Price Ratio (wine evaluation term)
QPS,Quark Publishing System
QR,Quake Rally,Qualitative Reasoning,Queensland Rail,Queen's Rangers,Quick Release,Quiet Riot,Qatar Airways (IATA airline designator)
QS,quantum sufficit (Latin,"as much as suffices")
QSCAT,Quick Scatterometer satellite
QSL,Québec Sign Language
QSO,Quasi-Stellar Object
QSTAG,Quadripartite Standardization Agreement ("cue-stag")
QT,Quentin Tarantino,QuickTime,QuikTrip,QT (cute) Software
Quango,(British Commonwealth) QUasi Autonomous Non-Governmental Organisation
Quasar,Quasi-stellar radio source
QUB,Queen's University Belfast
QUIET,Q and U Imaging ExperimenT (Q and U are the Stokes parameters of the CMBR polarization)
qv,quod vide (Latin "which see")
QVC,"Quality,Value,Convenience" (home shopping channel)
QWG,Quadripartite Working Group ("qwig")
QWGAOR,Quadripartite Working Group on Army Operational Research ("qwig-a-o-r")
QZ,Awair (IATA airline designator)
R,Reinforcing,Right,Röntgen,Restricted (movie rating)
R2I,Resistance to Interrogation
R3P,Rearm,Refuel,and Resupply Point
RA,Radio Australia
Ra,Radium
RA,Rain (METAR Code),Rear Area,Reinforced Alert,Republican Army,Right Ascension,Royal Artillery (UK),Royal Academy
RAA,Royal Automobile Association,South Australia,Rear Assembly Area
RAAF,Royal Australian Air Force
Rabobank,Raiffeisen-Boerenleenbank (from the two banks that merged to form the modern company)
RAC,Royal Automobile Club (in the United Kingdom,renamed RAC plc in 2002)
RACK,Risk Aware Consensual Kink (SM phrase)
Racon,RAdar beaCON
RADA,Royal Academy of Dramatic Art
Radar,Radio Detection And Ranging
RadB,Rad51/Dmc1 homologous protein
RADB,Real America Database,Resource Assessment Database,Reunion Address DataBase,Rice Allelopathy Data Base,Routing Arbiter Database
RADb,Routing Assets Data Base
RADC,Region Air Defence Commander
RAE,UK Royal Aircraft Establishment (-1991)
RAF,Red Army Faction,Royal Air Force
RAG,Raising and Giving,Rocket Antitank Grenade
RAGBRAI,Register's Annual Great Bicycle Ride Across Iowa
RAM,Rolling Airframe Missile,
RAM,Royal Air Maroc
Ramark,RAdar MARKer
RAOC,Rear Area Operation Centre
RAP, Radio Access Point,Radiological Assistance Program (U.S. Department of Energy),Rear Area Protection,Recognised [Operating/Operational] Air Picture,Recurring Advance Payment,Relational Associative Processor,Reliable Acoustic Path,Rocket-Assisted Projectile,Rule Against Perpetuities
RARDE,UK Royal Armament Research and Development Establishment (1962-1991)
RARE,Rapid Acquisition with Relaxation Enhancement (MRI technique)
RASC,Royal Army Service Corp,Former corps of British Army
RATELO,Radiotelephone Operator
Rb,Rubidium
RB,Running Back (football)
RBAR,Row By Agonizing Row,a derogatory way of describing a technique of scanning a set of records in a database to update or examine the contents of each one. This is the technique of last resort in most cases,since most database operations are optimized when using set based analysis instead of the RBAR method.
RBI,Runs Batted In
RBOC, Regional Bell Operating Company ("Baby Bell")
RC,see entry
RCA,Radio Corporation of America,Root Cause Analysis,Royal Canadian Artillery,Royal City Avenue (famous entertainment zone in Thailand)
RCAF,Royal Canadian Air Force
RCAR,Research Council for Automobile Repairs ("are-car")
RCC,Rescue Co-ordination Centre
RCCO,Royal Canadian College of Organists
RCHA,Royal Canadian Horse Artillery (regiment)
RCMP,Royal Canadian Mounted Police
RCRA,Resource Conservation and Recovery Act ("reck-ra" or "rick-ra")
RCS,Radar Cross-Section,Reaction Control System,Revision Control System
RCT,Randomized Controlled Trial,Robotically Controlled Telescope,Rugby club toulonnais (French,"Rugby Club of Toulon")
RD,Radio Disney
RDA,Research,Development,and Acquisition,Recommended Daily Allowance (Nutrition)
RDD,Radiological Dispersion Device
RDDL, Resource Directory Description Language ("riddle")
RDECOM,(U.S. Army) Research,Development and Engineering Command
RDM,Remotely Delivered/Deliverable Mine
RDO,Rapid,Decisive Operation,Regular Day Off,Remote Data Objects
RDS,Remote Desktop Services (Microsoft service),Réseau des sports (French,"Sports Network" — Canadian French-language TV channel),Respiratory distress syndrome,Royal Dublin Society (see also RDS Arena,a stadium on the grounds often called "the RDS")
RDT,Remote Digital Terminal
RDV,Remote Detection Vehicle
Re,Rhenium
RE,Royal Engineers
REACH,Registration,Evaluation,Authorisation and Restriction of Chemical Substances
REACT,Remote Electronically Activated Control Technology
REAM,Retired Educators Association of Minnesota
RECCE,Reconnaissance
REEF,Reef Environmental Education Foundation
REM,"Rapid Eye Movement (sleep phase),Rosicrucian Egyptian Museum"
REME,Royal Electrical and Mechanical Engineers
RERC,Rehabilitation Engineering Research Center
RES,Radiation Exposure Status,Reserve
RESNA,Rehabilitation Engineering and Assistive Technology Society of North America
REU,Réunion (ISO 3166 trigram)
RF,Radio Frequency,Receptive Field (neurophysiology)
Rf,Rutherfordium
RFC,Request for Comments,Royal Flying Corps (WWI precursor to RAF)
RFD,Request for Documentation
RFE,Request for Evaluation
RFEF,Real Federación Española de Fútbol (Spanish for Royal Spanish Football Federation)
RFF,Right of First Refusal (legal term)
RFI,y For Inspection,y For Issue,Request For Information,Radio Frequency Interference
RFID,Radio Frequency IDentification
RFL,Rugby Football League
RFP,Request for Proposal
RFQ,Request for Quotation
RFT,Request for Tender
RFU,Rugby Football Union
RG,Republican Guard
Rg,Roentgenium
RGB,Red Green Blue (colour model)
RGBI,Red Green Blue Intensity (ditto)
Rh,Rhodium
RH,Southern Rhodesia (ISO 3166 digram; obsolete 1980)
RHIC,Relativistic Heavy Ion Collider
RHLI,Royal Hamilton Light Infantry (Canadian militia regiment)
RHO,Southern Rhodesia (ISO 3166 trigram; obsolete 1980)
RHS,Right Hand Side,Redland High School,Royal Horticultural Society,London
RHU,Replacement Holding Unit
RHWR,Radar Homing and Warning Receiver ("raw" for short)
RI,Rex et Imperator,Regina et Imperatrix King-Emperor
RI,Rhode Island (postal symbol)
RIAA,Recording Industry Association of America
RIBA,Royal Institute of British Architects
RIF,Reduction In Force (layoffs),Resistance Index for Frostbite,ing Is Fundamental
RIFA,Red imported fire ant
RILA,Retail Industry Leaders Association
RIM,Remote integrated multiplexer,Australian term for a digital loop carrier,Research In Motion,former name of the BlackBerry company,Revolutionary Internationalist Movement (Maoist organization),Royal Indian Marine,former navy of British colonial India
RIMVS,Retinal Imaging Machine Vision System
RINO,Republican In Name Only[1]
RIP- Relief In Place,requiesca[n]t in pace (Latin for "may he/she/they rest in peace")
RIS,Range Instrumentation System,Réseau Info Sports (French,roughly "Sports News Network" — Canadian French-language TV channel)
RISC,Reduced Instruction Set Computer
RISD,Rhode Island School of Design ("riz-dee")
RISTA,Reconnaissance,Intelligence,Surveillance,and Target Acquisition (see also ISTAR)
RJD,Reduced Julian Day
RKBA,Right to Keep and Bear Arms (Second Amendment to the United States Constitution)
RKI,Robert Koch Institute,German governmental research institute in Berlin
RKO,Radio-Keith-Orpheum Pictures
RL,Release Line,Real Life
RLP,Recognised [Operating/Operational] Land Picture
RLS,Restless Leg Syndrome
RLY,Rally Point
RM,see separate disambiguation page
RMC,Robert Menzies College
RMDA,Records Management and Declassification Agency
RMP,Recognised [Operating/Operational] Maritime Picture
RMS,Rate-Monotonic Scheduling,Richard M. Stallman,Root-Mean-Square,Royal Mail Ship (e.g. RMS Titanic)
RN,Radio Netherlands
Rn,Radon
RN,Royal Navy,Registered Nurse (US)
RNA,RiboNucleic Acid
RNAD,Royal Naval Armaments Depot (UK)
RNPS,Radio Network Planning System
RNZ,Radio New Zealand
RNZI,Radio New Zealand International
RO,Range Only,Red Orchestra,Romania (ISO 3166 and FIPS 10-4 country code digram)
ROA, Rate Of Ascent
ROC,Receiver Operating Characteristic (statistics),Regional Operations Centre,Republic Of China,Roc-A-Fella Records,Regional Organisations of Councils
ROD, Rate Of Descent,Record Of Decisions,Report Of Discrepancy
ROE,Rules Of Engagement
ROFLOL,Rolling On the Floor Laughing Out Loud
ROH,Ring of Honor
ROI,Return On Investment,Republic of Ireland.
ROK, Republic of Korea
ROM,-Only Memory,Refuel On the Move,Royal Ontario Museum
ROP,Render Output Pipeline
ROPE,Research Opportunity and Performance Evidence
ROS,Reactive Oxygen Species
ROTC,Reserve Officer Training Corps ("Rawt-Cee")
ROU,Romania (ISO 3166 trigram)
ROV,Remotely Operated Vehicle
ROW,Right Of Way,Rest Of the World
ROWPU,Reverse Osmosis Water Purification Unit ("roe-pew")
ROZ, Restricted Operations Zone
RP,Philippines (FIPS 10-4 country code),Release Point,Role-Playing [relationship potential]
RPA,Regional Plan Association
RPD,Recognition-Primed Decision-making
RPF,Rwandan Patriotic Front
RPG,(US-CA) Regional Planning Group,Report Program Generator,Rocket Projectile Gun,Rocket-Propelled Grenade,Role-Playing Game
RPL,Reverse Polish Lisp
RPM,Records,Promotion,Music (expansion of the title of a former Canadian music magazine),Red Hat Package Manager
rpm,revolutions per minute
RPN,reverse Polish notation
RPO,Radiation Protection Officer,Regular Production Option,RPR-FOM,(i/a) Realtime Platform Reference Federation Object Model ("reaper fomm")
rps,revolutions per second
RPV,Remotely Piloted Vehicle
RQ,Puerto Rico (FIPS 10-4 territory code)
RRB,Railroad Retirement Board
RRN,Recurrence Rate Number
RRP,Recurrent Respiratory Papillomatosis
RRS,Racing Rules of Sailing
RRSP,Registered Retirement Savings Plan (Canada; roughly equivalent to the IRA in the U.S.)
RS,Russia (FIPS 10-4 country code)
RSA,Regimental Support Area,Republic of South Africa,Rivest-Shamir-Adleman encryption,South Africa (IOC and FIFA trigram,but not ISO 3166)
RSEQ,Réseau du sport étudiant du Québec (French,"Quebec Student Sports Network")
RSI,Repetitive Strain Injury
RSJ,Rolled Steel Joist (construction)
RSN,Real Soon Now (coined by author Jerry Pournelle)
RSPB,(UK) Royal Society for the Protection of Birds
RSPCA,Royal Society for the Prevention of Cruelty to Animals
RSR,Required Supply Rate
RSRE,UK Royal Signals and Radar Establishment (1976-1991)
RSRI,Red Sands Research Institute
RSS,Really Simple Syndication
RSTA,Reconnaissance,Surveillance,and Target Acquisition
RSVP,répondez s'il vous plaît (French for "respond if you please")
RT,Real Time,Radio Telephone,Return to duty
RTA,Road traffic accident (British)
RTBF,Radio-Télévision belge de la Communauté française
RTCA,RTCA,Inc.
RTF,Rich Text Format
RTFM, the Fucking/Fine Manual
RTG,Radio-isotope Thermoelectric Generator also used for Rubber Tyred Gantry crane
RTGS,Royal Thai General System of Transcription,Real Time Gross Settlement
RTI,Run-Time Infrastructure (Simulation)
RTL,see entry
RTLS,Return to Launch Site,period in NASA Space Shuttle assent profile where,during assent,shuttle aborts assent and turns and glides back to landing strip at launch site
RTP,Real-time Transport Protocol
RTS,see entry
RTT,Round Trip Timing
RTV,Rapid Terrain Visualization ACTD,Retro Television Network
RU,Russia (ISO 3166 digram)
Ru,Ruthenium
RUC,Royal Ulster Constabulary
RUS,Russia (ISO 3166 trigram)
RUSI,Royal United Services Institute for Defence Studies
RV,Reconnaissance Vehicle,Recreational Vehicle,Re-entry Vehicle,reciprocation void
RVD,Rijksvoorlichtingsdienst (Dutch,"Government Information Service"),Rob Van Dam (American professional wrestler),RW[edit]
RW,Rwanda (ISO 3166 and FIPS 10-4 country code digram)
RWA,Rwanda (ISO 3166 trigram)
RWADA,Resident Weighted Average Daily Attendance (New York State term used in public education to indicate the size of a school district,i.e. its number of students)
RWH,Rain Water Harvesting
RWR,Radar Warning Receiver
RWS,Remote Weapon Station
Rx,Medical prescription (possibly from Latin "recipere","to take": see entry)
RX,Receive
SA,Sand (METAR Code),Saudi Arabia (ISO 3166 and FIPS 10-4 country code digram),Sexaholics Anonymous,sine anno (Latin,“without year”),Situational awareness,South Africa,(i/s) South Australia (postal symbol),Standards Australia,Sturmabteilung (German,“Storm Detachment”,Nazi forerunner and rival of SS),S.A.,designation for a corporation in many European countries; see article for meanings
SAA,Saudi Arabian Airlines,former name of Saudia,Sex Addicts Anonymous,South African Airways,Southern Athletic Association,Standards Association of Australia,a former name of Standards Australia,SAAB —  Svenska Aeroplan AB (Swedish aircraft manufacturer; also refers to its former auto manufacturing arm),SAAFR —  Standard use Army Aircraft Flight Route (“safer”),SAAMI —  Sporting Arms and Ammunition Manufacturers' Institute (“sammy”),SAARC —  South Asian Association for Regional Cooperation,SAB —  Soprano Alto Baritone,Sabena —  Société anonyme belge d'exploitation de la navigation aérienne (French for “Belgian Company for Exploiting Aerial Navigation”,1923-2001),SABIC —  Saudi Basic Industries Corporation,SABR —  Society for American Baseball Research
SAC,Standards Activity Committee (of SISO),U.S. Strategic Air Command (1946-1992),SACAT —  Semi Attended Customer Activated Terminal (Supermarket checkout),SACEUR —  Supreme Allied Commander EURope,SACLANT —  Supreme Allied Commander atLANTic,SACLOS —  Semi-Automatic Command to Line of Sight
SAD,Seasonal Affective Disorder,Situational Awareness Display,SADD —  originally Students Against Drunk Driving,now Students Against Destructive Decisions (U.S. national school-related group)
SADL,Situation Awareness Data Link (“saddle”),Structural Architecture Description Language
SALT- Save A Life Today (SALT) Alert; Emergency Contact System,Southern African Large Telescope,Strategic Arms Limitation s
SAM,Sequential-Access Memory,Sociedad Aeronáutica de Medellín,Surface-to-Air Missile
Sambo,(p/a) Samooborona bez oruzhiya (Russian: "Самооборона без оружия",literally "self-defense without weapons")
SARA,Southeastern Association for Research in Astronomy,Scientific Atlanta Resident Application,Scottish Amateur Rowing Association,Southern African Railway Association,State Administration for Religious Affairs,SARP —  Search And Rescue Processor,SARR — (i/a) Search And Rescue Repeater,SARS —  Severe Acute Respiratory Syndrome
SART,Search and Rescue Transponder,Situational Awareness Rating Technique,SARU —  South African Rugby Union
SAS,Scandinavian Airlines System,Second Avenue Subway,Situational Awareness System,Special Air Service,Studies,Analysis and Simulation,Side Angle Side,Statistical Analysis System (original meaning; SAS Institute Inc. has evolved far beyond that scope),SASE —  Self-Addressed Stamped Envelope,SASO —  Stability and Support Operations,SASOL —  Suid Afrikaanse Steenkool en Oli.e. (Afrikaans,“South African Coal and Oil”)
SAT,formerly Scholastic Aptitude Test and Scholastic Assessment Test; now known solely by the initials,Small Arms Trainer,SATB —  Soprano Alto Tenor Bass,SATNAV —  Satellite Navigation (Increasingly common GPS based system in new vehicles),SATs —  Standard Assessment Tasks and other similar terms describing tests used in English schools; see National Curriculum assessment#Terminology,SAU —  Saudi Arabia (ISO 3166 trigram),SAVAK —  Sazamane Etelaat va Amniate Kechvar (Iranian “Security and Intelligence Service”)
SAW,Squad Automatic Weapon,Surface acoustic wave,SAWE —  Society of Allied Weight Engineers,SB[edit],Sb —  Antimony (Latin Stibium)
SB,Sexy Bitch,Sexy Bastard,Sexy Boy (disambiguation),Solomon Islands (ISO 3166 digram),Special Warfare Boat Operator
SBA,Santa Barbara Airport,Simulation-Based Acquisition,Sovereign Base Area,Student bar association,SBB —  German for the Swiss Federal Railways
SBNO,Standing but not operating (in reference to amusement parks)
SBP,Samahang Basketbol ng Pilipinas (Filipino,"Basketball Federation of the Philippines"),U.S. School Breakfast Program,Society of Business Practitioners,State Bank of Pakistan
SBS,Special Boat Service,Special Broadcasting Service,Seoul Broadcasting System
SC,Cruiser Submarine (US Navy hull classification) c Saint Kitts and Nevis (FIPS 10-4 country code; from Saint Christopher),Seychelles (ISO 3166 digram),South Carolina (postal symbol)
SCS,Scan Correlated Shift,Soil Conservation Service
SD,Secure Digital (memory card format),Sheriff's department,Smoke/Decontamination,South Dakota (postal symbol),Sudan (ISO 3166 digram)
SDHC,Secure Digital High Capacity
SDXC,Secure Digital eXtended Capacity
SE,Seychelles (FIPS 10-4 country code),Societas Europaea (form of business organization in the EU),South-east,Sweden (ISO 3166 digram),Synthetic Environment,System Engineering,SEAD —  Suppression of Enemy Air Defence,SEADI —  Senior Executioner of Approved Driving Instructors,SEAFDEC —  Southeast Asian Fisheries Development Center,SEAL —  SEa-Air-Land,SEAT —  Sociedad Española de Automóviles de Turismo (Spanish for "Spanish Touring Car Company"),SEATO —  Southeast Asia Treaty Organization,SeaWiFS —  Sea-Viewing Wide Field of View Sensor (satellite instrument)
SEM,Sensor Employment Manager,Switch to Email Mode,i.e. stop texting as it is more disruptive by making a sound or vibrating and email instead,for a given time
SEN,Senegal (ISO 3166 trigram),Small Extension Node
SEP,Somebody Else’s Problem,Spherical Error Probable,System Enhancement Package,System Engineering Plan,SEPTA —  Southeastern Pennsylvania Rapid-Transit Authority,SERE —  Survival,Evasion,Resistance and Escape,SESSPE —  Submarine Escape and Surface Survival Personnel Equipment,SET —  Staphylococcal EnteroToxin,SETI —  Search for ExtraTerrestrial Intelligence,SETAC —  Society for Environmental Toxicology and Chemistry
SEU,Single Event Upset (solid state physics),Slightly Enriched Uranium,Special Evidence Unit,SF[edit]
SF,Fleet Submarine (retired US Navy hull classification),San Francisco,Science fiction,South Africa (FIPS 10-4 country code),Speculative fiction,Special Forces
SFA,Sales force automation,Saturated fatty acid,Scottish Football Association,Stephen F. Austin (State University),Sudan Football Association
SG,Senegal (FIPS 10-4 country code),Singapore (ISO 3166 digram),Snow Grains (METAR Code),Study Group
SH,Saint Helena (ISO 3166 digram),SONATRACH (Algerian petroleum company)
SHAC,Stop Huntingdon Animal Cruelty,Student Health Action Coalition,SHAPE —  Supreme Headquarters Allied Powers Europe,SHF —  Super High Frequency,SHN —  Saint Helena (ISO 3166 trigram)
SHO,Showtime (see also sho.com)
SI,Slovenia (ISO 3166 and FIPS 10-4 country code digram),Socialist International,Sports Illustrated,Système International (French,International System of Units),SIA —  Singapore Airlines (ICAO code),SIA —  Survivors of Incest Anonymous,SIAM —  Society for Industrial and Applied Mathematics,SIC —  Standard Industrial Classification,SICS —  Swedish Institute of Computer Science,SIDS —  Sudden infant death syndrome,SIDU —  select,insert,delete,update. See Create,read,update and delete,SIF —  Selective Identification Feature,SIFF —  Successor IFF
SIG,Schweizerische Industrie Gesellschaft (German,"Swiss Industry Company"). See also SIG Sauer,a firearms manufacturer spun off from the aforementioned company in 2000.,.signature (UNIX shell/Internet standard file name), Special Interest Group,SIGCAT —  Special Interest Group for CD-ROM Applications and Technology,SIGINT —  Signals Intelligence,SIGMET —  Significant Meteorological Information
SIIT,Saskatchewan Indian Institute of Technologies (Canadian university),Sirindhorn International Institute of Technology (Thai university),Stateless IP/ICMP Translation algorithm,SIMAC —  Semantic Interaction with Music Audio Contents,SIMLAS —  Soldier Integrated Multipurpose Laser System,SIMM —  Single In-line Memory Module,SIMNET —  SIMulator NETwork,later SIMulation NETwork,SIMNET-D,SIMNET-Developmental,SIMP —  Strongly Interacting Massive Particle
SIP,Session Initiation Protocol,State Implementation Plan,System Improvement Program,Systematic Investment Plan,SIPP —  Self-Invested Personal Pension
SIRI,Service Interface for Real Time Information
Siri,Speech Interpretation and Recognition Interface (Apple iOS software)
SISO,Simulation Interoperability Standards Organization,Society of Independent Show Organizers,SIW —  Simulation Interoperability Workshop,SIYSS —  Stockholm International Youth Science Seminar,SJ[edit]
SL,Sierra Leone (ISO 3166 and FIPS 10-4 country code digram),Start Line
SLOC,Sea Lines Of Communication,Source Lines Of Code,SLORC —  State Law and Order Restoration Council (of Burma)
SLP,Sea Level Pressure,Super Long Play,slph —  Standard litre per hour (air flow),slpm —  Standard litre per minute (air flow),slps —  Standard litre per second (air flow),SLR —  Single-Lens Reflex (camera)
SME,Scan Mirror Electronics,Subject Matter Expert
SMX-many,including:  Server Macro Expansion,Solaris MINIX,Spatial multiplexing,Sulfamethoxazole; see entry
SNL,Saturday Night Live (television),Società Navigazione del Lago di Lugano,SNM —  Special Nuclear Material,SNMP —  Simple Network Management Protocol,SNOBOL —  StriNg Oriented symBOlic Language,SNP —  Single-nucleotide polymorphism
SO,Shared Object (Unix),Sheriff's Office,Significant other,Somalia (ISO 3166 and FIPS 10-4 country code digram)
SOA,service-oriented architecture,Society of Actuaries,State of the art
SOAP,Simple Object Access Protocol,Supplemental Offer and Acceptance Program (U.S. medical residency matching)
SOB,Son Of a Bitch,Same Old Bullshit,SOC —  Sector Operations Centre,SOCCSKSARGEN —  South Cotabato,Cotabato,Sultan Kudarat,Sarangani,General Santos City (a region in the Philippines; pronounced “sock-sar-gen”),SOCOM —  (U.S.) Special Operations Command
SoCon,Southern Conference (U.S. college sports)
SOD,School Of Dentistry,Statement Of Difference[s],Statement Of Direction,Statement Of Documentation,Statement Of Duty/Duties
SOE,Secret Of Evermore,Special Operations Executive (WWII British organization),State Of Emissions (EW)
SOF- Special Operations Force,Status of Forces,SOFIA —  Stratospheric Observatory For Infrared Astronomy
SOM,Simulation Object Model,Somalia (ISO 3166 trigram),Sonar —  SOund Navigation And Ranging
SOP,Standing/Standard Operating Procedure,State of Play
SOR,State Of iness,Statement Of Requirements
Sp,Special,Spring tide (nautical charts),sine prole (Latin,“without offspring”)
SR,Sound Reinforcement,Supply Route,Suriname (ISO 3166 digram),Sveriges Radio (Swedish Radio Ltd),SR —  Sustained release of a drug
SRG,SACEUR Rover Group,Special Republican Guard,SRGW —  Short-Range Guided Weapon
SS,Sand Storm (METAR Code),Schutzstaffel (German,roughly "Protection Squadron"; Nazi elite Praetorian guard),U.S. Secret Service,Spanish Ship,Stainless steel,Stockholm Skins,Submarine (US Navy hull classification),Super Sport,Surface-to-Surface (missile)
SSA,Cargo Submarine (US Navy hull classification),Social Security Administration (U.S.),Statistics South Africa,SSB —  Single-sideband modulation,SSB —  Sacramento Sustainable Business,SSBN —  Nuclear-Powered Ballistic Missile Submarine (US Navy hull classification)
SSC,Safe,Sane,Consensual (SM phrase),Secondary Somatosensory Cortex,Smaller-Scale Contingency,U.S. Army Soldiers System Center (Natick,Massachusetts),Superconducting Super Collider,SSCCATAGAPP — Singles,Seniors,Childless Couples,And Teens And Gays Against Parasitic Parents (fictional organization from The Simpsons)
SSD,Solid-state drive,South Sudan (ISO 3166 trigram),SSDC —  U.S. Space and Strategic Defense Command
SSDD,Same Shit,Different Day,Single-Sided Double-Density (floppy disk)
SSE,South South-East,Streaming SIMD Extensions,SSG —  Guided Missile Submarine (retired US Navy hull classification),SSGN —  Nuclear-Powered Guided Missile Submarine (US Navy hull classification),SSH —  Saffir-Simpson Hurricane scale,SSK —  Hunter-Killer Submarine (retired US Navy hull classification),SSKP —  Single-Shot Kill Probability,SSL —  Secure Sockets Layer,SSM —  Surface-to-Surface (Guided) Missile
SSN,Nuclear-Powered Attack Submarine (US Navy hull classification),SIM Serial Number,Social Security Number (U.S.),Socialist Solidarity Network,Subsystem number (SCCP,SS7),SSNW —  Same Shit,New Wrapping,SSO —  Submarine Oiler (retired US Navy hull classification),SSP —  Submarine Transport (retired US Navy hull classification)
SSR,Radar Picket Submarine (retired US Navy hull classification),Solid State Recorder
SSRI,Selective Serotonin Reuptake Inhibitor,Social Systems Research Institute
SSRN,Social Science Research Network,Nuclear-Powered Radar Picket Submarine (retired US Navy hull classification)
SSS,Siding Spring Survey,Side Side Side (an acronym for remembering congruent triangles),Sigue Sigue Sputnik (band),S/SSM —  Surface-to-Subsurface Missile
ST,Saint Lucia (FIPS 10-4 country code),São Tomé and Príncipe (ISO 3166 digram)
STA,Scheduled Time of Arrival,Surveillance and Target Acquisition,STAG —  (U.S.) Strategy and Tactics Group,STAGE —  Scenario Toolkit And Generation Environment,STANAG —  (NATO) Standardisation Agreement
STAR,Scientific and Technical Aerospace Reports (NASA),Simulation of Tactical Alternative Responses,Special Threat Analysis and Recognition
STAT,Signal Transducers and Activators of Transcription (cell biology),Special Tertiary Admissions Test (Australia)
STB,Surface Transportation Board[2]
STFU,Southern Tenant Farmers Union,Stuff You[citation needed],STH — Sonic The Hedgehog
STI,Sexually Transmitted Infection,Subaru Tecnica International,STK —  Satellite Tool Kit,STM —  Short Term Memory,STOL —  Short Take-Off and Landing,STOVL —  Short Take-Off and Vertical Landing
STP,São Tomé and Príncipe (ISO 3166 trigram),Standard Temperature and Pressure,STR —  Short Tandem Repeat (DNA analysis),STRATCOM —  United States Strategic Command
SU,Soviet Union (ISO 3166 digram; obsolete 1992),Sudan (FIPS 10-4 country code),SUB —  Student Union Building,SuD —  Subject under Discussion,SUDC — Swedish United Dawah Center,a salafist Islamic organisation in Sweden
SV,El Salvador (ISO 3166 digram),Sportverein (German for “Sport Association”,as in Hamburger SV and SV Werder Bremen),SVC —  Secondary Visual Cortex,SvD —  Svenska Dagbladet (Swedish newspaper)
SWA,Secure Web Access,South-West Asia
SWAC,Southwestern Athletic Conference
SWALK,Sealed With A Loving Kiss,
SWAN,System for Wearable Audio Navigation
SWAP,Surface Waters Acidification Programme,
SWAPO,South-West Africa People's Organisation,
SWAT,Special Weapons And Tactics
SWE —  Sweden (ISO 3166 trigram)
SWF,Single White Female
SWG,Surface Warfare Group,Symbology Working Group,SWHR —  Society for Women's Health Research,SWIG —  Simplified Wrapper and Interface Generator,SWIR —  Short Wave InfraRed (“ss-why-are” or “swhirr”)
SWLABR,She Was Like A Bearded Rainbow,Cream song (Bruce,Clapton and Baker),SWORD —  Subjective WORkload Dominance,SWORDS —  Special Weapons Observation Reconnaissance Detection System,SWOT —  Strengths,Weaknesses,Opportunities,Threats (mnemonic)
SWP,Special Working Party (“swipp”),Systematic Westing Plan (a plan of periodic westing of shares or mutual funds worth a fixed amount of money),Skill With Prizes (UK pub quiz machines — quality titles include: Pub Quiz,Quiz City,Frog in a Liquidizer,Who Wants To Win a Tenner?),SWT —  Sea Water Tank,SWV —  Sisters With Voices (American female R&B vocal group),SWZ —  Swaziland (ISO 3166 trigram),SX[edit],SX —  Sonic X
T,Tera,Tesla,Tritium
Ta,Tantalum
TA,Target Acquisition,Teaching Assistant,Tera-ampere,Territorial Army (UK),Tristan da Cunha (ISO 3166 digram)
TAA,Transparency Anti-Aliasing,Trans Australia Airlines
TAACOM,U.S. Theater Army Area Command
TAADCOORD,Theatre Army Air Defence Co-ordinator
TAAR,Trace Amine-Associated Receptor
TAC,U.S. Tactical Air Command (1946-1992)
TACAN,Tactical Air Navigation
TACC,Tactical Air Control Centre,(USAF) Tanker Airlift Control Center
TACCO,Tactical Coordinator
TACCSF,U.S. Theater Aerospace Command & Control Simulation Facility
TACDAR,Tactical Detection And Reporting
TACP,Tactical Air Control Party,Technology Applications Certification Program
TACSOP,Tactical SOP (Standing Operating Procedure)
TADIL,Tactical Digital Information Link
TADL,Tactical Air Data Link ("taddle")
TADSS,Training Aids,Devices,Simulators,and Simulations
TAI,Target[ed] Area of Interest
TAJ,Tom and Jerry
TAJT,Tom and Jerry Tales
TALES,Technical Advice and Lexicon for Enabling Simulation
TAN,Tanzania (IOC and FIFA trigram,but not ISO 3166)
TANJ,There Ain't No Justice (used as expletive in the Ringworld novels)
TANP,Terrain-Aware Network Planner
TANSTAAFL,There Ain't No Such Thing As A Free Lunch (coined by author Robert A. Heinlein in his The Moon Is a Harsh Mistress)
TAPPS,Texas Association of Private and Parochial Schools
TARDIS,Time And Relative Dimension In Space (from Doctor Who)
TAROT,Télescope à action rapide pour les objets transitoires (French,"Transient Object Rapid Action Telescope")
TARP,Transparency Accountability Rights for Parents (coined by Karen Plumridge,founder of Black Ribbon Gold Heart)
TAS,Tasmania (postal symbol)
TASER,Thomas A. Swift's Electric Rifle
TASM,Tactical Air-to-Surface Missile
TAT,Tourism Authority of Thailand
TATP,TriAcetone TriPeroxide
TATT,Tired All The Time (medical diagnosis in-joke)
Tb,Terbium
TB,Tuberculosis
TBA,to be announced
TBBPA,TetraBromoBisPhenol-A
TBC,to be confirmed,to be continued
TBD,"to be done, or: to be documented, or: to be determined, or: to be decided"
TBF,to be fair
TBGRI,Tropical Botanic Garden and Research Institute,India
TBH,To Be Honest
TBL,Turkish Basketball League
TBM,Tactical Ballistic Missile,Theatre Ballistic Missile
TBS,Turner Broadcasting System
TBT,Tributyltin
Tc,Technetium
TC,Teracoulomb,Turks and Caicos (ISO 3166 digram),United Arab Emirates (FIPS 10-4 country code; from Trucial Coast States)
TCA,Transformational Communications Architecture,Turks and Caicos (ISO 3166 trigram)
TCAA,Top Counter-Assault Agents
TCAS,Traffic Collision Avoidance System
TCCCS,"Tactical Command,Control and Communication System"
TCD,Chad (ISO 3166 trigram)
TCG,Trusted Computing Group,Türkiye Cumhuriyeti Gemisi
TCHD,Truck Cargo Heavy Duty
TCL,Tool Command Language
TCM,Turner Classic Movies
TCP,Traffic Control Point,Transmission Control Protocol,Trichlorophenol
TCU,Texas Christian University
TCW,Tasty Coma Wife
TCWMS,Tele-Center Workforce Management System
TD,Territorial Decoration,Toon Disney,Toronto-Dominion (Bank); see also its U.S. subsidiary,TD Bank,N.A.,Touchdown,Tower Defence A game type,involves defending waves of enemies using tower
TDA,The Disney Afternoon
TDL,Tactical Data Link
TDM,Time-Division Multiplexing
TDMA,Time Division Multiple Access
TDP,Technology Demonstration Programme
TDRS,Tracking Data and Relay Satellite
TE,Tactical Exploitation,Testosterone to Epitestosterone ratio,Tight end (American football; position generally not used in modern Canadian football)
Te,Tellurium
TEAL,Tasman Empire Airways Limited
Team,Together everyone achieves more
TEAMS,The East African Marine System (fiber optic cable)
TED,Technology Entertainment Design prize
TEETH,Tried Everything Else,Try Homeopathy (medical diagnosis in-joke)
TEL, Transporter,Erector and Launcher
TELAR,Transporter,Erector,Launcher And Radar
TENCAP,Tactical Exploitation of National Capabilities
TERS,Tactical Event Reporting System
TES,Tactical Event System
TEST,Thesaurus of Engineering and Scientific Terms
TEU,Twenty-foot equivalent unit (cargo capacity)
TeVeS,Tensor Vector Scalar theory
TF -
TFMPP,Trifluorophenylmethylpiperazine
TFR,Total Fertility Rate
TFT,Thin-Film Transistor
Tg,Teragram
TG,Togo (ISO 3166 digram)
TGA,Tonga (IOC and FIFA trigram,but not ISO 3166)
TGB,Tres grande bibliothèque (French,"Very Large Library"),a sarcastic nickname for the Bibliothèque nationale de France
TGIF,Thank God It's Friday,Toes Go In First
TGO,Togo (ISO 3166 trigram)
TGT,Target (also the ticker symbol for Target Corporation),Ticket Granting Ticket (computer security),Tyrese,Ginuwine,Tank,see TGT (group) for their collaboration
TGV,Tanjong Golden Village (Malaysian cinema chain),Tanora malaGasy Vonona (Malagasy,"Young Malagasies Determined",political party),Test Generation with Verification,Train à grande vitesse (French for "High-Speed Train"),TH[edit]
TH,Terahenry,Thailand (ISO 3166 and FIPS 10-4 country code digram)
Th,Thorium
THA,Thailand (ISO 3166 trigram)
THAAD, Terminal High Altitude Area Defence
THEGENTRY,The High-End Group of Earth's New Technologies Research Yield
THEL,Tactical High Energy Laser ACTD
THG,Tetrahydrogestrinone
THX,"Thanks" in SMS language
TI,Tajikistan (FIPS 10-4 country code),Thermal Imaging,Threat Identification,Training Instructor,Texas Instruments
Ti,Tebi,Titanium
TIA,Total Information Awareness initiative
TIA,Transient Ischemic Attack
TIALD,Thermal Imaging and Airborne Laser Designation
TIBS,Tactical Information Broadcast System
TIC,Troops In Contact
TID,Target Identification,ter in die (Latin,"three times daily")
TIGERS,Topologically Integrated Geographic Encoding and Referencing System
TIM,Technical Information Memorandum,Technical Interchange Meeting,Toxic Industrial Material,Telecom Italia Mobile
TIMS,Tactical Internet Management System,The Institute of Management Sciences,The International Molinological Society,Thermal Infrared Multispectral Scanner,Thermal Ionization Mass Spectrometry,Travel Information Management Services,Tuberculosis Information Management System
TINC,There Is No Cabal
TINY,That Is,Not You (internet slang)
TIP,Thermal Identification Panel
tits,Toes in the Sand
TJ,Tajikistan (ISO 3166 digram),Terajoule
TJD,Truncated Julian Day
TJK,Tajikistan (ISO 3166 trigram)
TK,Terakelvin,Tokelau (ISO 3166 digram)
TKBL,Türkiye 1. Kadınlar Basketbol Ligi,the Turkish-language name of the Turkish Women's Basketball League
TKL,Tokelau (ISO 3166 trigram)
TKM,Turkmenistan (ISO 3166 trigram)
TL,Team Leader,Teralitre,Timor-Leste (ISO 3166 digram),ThermoLuminescence,TL;DR ,Too long; didn’t read.
Tl,Thallium
TLA,Three-Letter Abbreviation/Acronym
TLAM,Tomahawk Land Attack Missile
TLAR,That Looks About Right (chat shorthand),Transporter-Launcher And Radar
TLATOJL,The Life and Times of Juniper Lee
TLC,Tender Loving Care,The Learning Channel (now known strictly by the initials),Thin Layer Chromatography,T-Boz,Lefteye,Chilli,Tables,Ladders,and Chairs (type of professional wrestling match)
TLD,Thermoluminescent Dosimeter,Top-Level Domain
TLM,Traditional Latin Mass,Tridentine Latin Mass,Transaction Lifecycle Management
TLPM,T1 Line Performance Monitor
TLS,Timor-Leste (ISO 3166 trigram),Times Literary Supplement,TM[edit]
TM,Technical Manual,Theatre Missile,Thematic Mapper,trademark (often written in small superscript type: TM or ™),Turing machine,Turkmenistan (ISO 3166 digram) Tympanic Membrane
Tm,Terametre
TMA,Terminal Manoeuvring Area (restricted flying zone),Texas Medical Association,Tristeza y muerte de agave (Spanish,"wilting and death of agave"),a disease affecting the blue agave,from which the popular spirit tequila is produced
TMAP, Texas Medication Algorithm Project
TMC,The Movie Channel
TMD,Theatre Missile Defence
TMDK,The Mighty Don't Kneel (Australian professional wrestling stable also active in Japan)
TMI,Too Much Information
TMJ,TemporoMandibular Joint (syndrome)
TMNT,Teenage Mutant Ninja Turtles
TMO,Table Mountain Observatory,Television match official (rugby union)
TMP,East Timor (ISO 3166 trigram; obsolete 2002),Temporary
TMPG,Transparent Multi-Platform Gateway
TMR,Twin Main Rotors (helicopter type)
TMS,Transcranial Magnetic Stimulation
TMT,Thirty Meter Telescope
TMTOWTDI,There's  Than One Way To Do It (from Perl)
TMZ,Thirty-Mile Zone,an area in and around Los Angeles considered "local" under entertainment industry union work rules
TN,Tennessee (postal symbol),Teranewton,Tonga (FIPS 10-4 country code),Tunisia (ISO 3166 digram)
TNA,Total Nonstop Action Wrestling
TNO,Trans-Neptunian Object
TNT,Thomas Nationwide Transport,an Australian company that was one of the predecessors to the former TNT N.V. and the current TNT Express,TriNitroToluene, Turner Network Television,TO[edit]
TOA,Table Of Authorities,Total Obligation Authority (accounting)
TOAD,Temporary,Obsolete,Abandoned,or Derelict site (urbanism),Towed Optical Assessment Device
TOBS,Time of OBServation
TOC,"Table Of Contents, Tactical Operations Centre, Temporo-Occipital transition Cortex, Top of Concrete"
TOG,"Togo (IOC and FIFA trigram,but not ISO 3166)"
TOGS,Thermal Observation Gunnery Sight
TOMS,Total Ozone Mapping Spectrometer (satellite instrument)
TON,Tonga (ISO 3166 trigram)
TOS,"Tape Operating System,Terms of service,The Original Series,used to distinguish the first Star Trek TV series from other parts of the media franchise,Tramiel Operating System"
TOT,Time On Target
TOW,"Tube-launched,Optically tracked,Wire-guided (anti-tank missile)"
TP,"East Timor (ISO 3166 digram; obsolete 2002),São Tomé and Príncipe (FIPS 10-4 country code),Training Practice,Trident Ploughshares"
TPE,Chinese Taipei (IOC and FIFA trigram for the country also known as Taiwan)
TPI,The point is
TPO,Thrombopoietin
TPS,The Pennington School
TPTB,The Powers That Be (often used to refer to the people responsible for the content of TV series or movies)
TQ,Top Qualifier (similar to Pole Position in car racing)
TRA,Technology iness Assessment
TRAC,(U.S. Army) TRADOC Analysis Center
TRACON,Terminal Radar Approach Control
TRADOC,(U.S. Army) Training and Doctrine Command
TRAIN,Tourist Railway Association,Inc.
TRANSCOM,U.S. Transportation Command
TRAP,Tactical Receive equipment and related Applications
TRASANA,TRADOC Systems Analysis Agency
TRD,Towed Radar Decoy
TRIGAT,Third Generation Antitank (missile)
TRL,Technology readiness level
TRP,Target Reference Point,Time of Reporting
Trp,Troop
TRU,Transuranic
TRUEX,Training in Urban Environment Exercise
TRW,Thompson Ramo Wooldridge Inc.
Ts,Terasecond
TS,"Terasiemens,Thunderstorm (METAR code),Tunisia (FIPS 10-4 country code),TinySex,Transsexual, Tough Sh*t"
TSA,"Theatre Storage Area,Time Slot Allocation,Transportation Security Administration,The Salvation Army"
TSCA,Toxic Substances Control Act ("tosca")
TSEC,Transmission Security Encryption Code
TSL,Transportation Security Laboratory
TSN,"The Sporting News (historic name of the periodical now known as Sporting News),The Sports Network"
TSO,"The Stationery Office (was HMSO until 1996),(U.S.) TRICARE Support Office,Trans-Siberian Orchestra (band)"
TSOP,"Tactical Standing Operation Procedure,The Sound of Philadelphia (classic 1970s R&B instrumental)"
TSR,Terminate and Stay Resident
TSSIA,The Subject Says It All
TT,"Teratesla,Terrestrial Time,Tourist Trophy (Motorcycle sport),Trinidad and Tobago (ISO 3166 digram)"
TTCT,Torrance Tests of Creative Thinking
TTFN,Ta Ta For Now
TTL,"Tax,Title,License,Through-the-lens (photography),Time 'till live,Time to live,Transistor-transistor logic"
TTO,Trinidad and Tobago (ISO 3166 trigram)
TTP,"Tactics,Techniques,and Procedures,Thrombotic thrombocytopenic purpura,Trailer Transfer Point"
TTTEAF,Thomas the Tank Engine and Friends
TTY,TeleTYpewriter (Printer)
TTYL,To You Later (Internet slang)
TTZ,Tetrazolium
TU,"Technische Universität (German for 'Technical University'),Thammasat University (Thailand),Turkey (FIPS 10-4 country code)"
TUC,Trades Union Congress
TUG,TeX Users Group
TUI,"Text-based user interface (cf. CLI),among other uses"
TUN,Tunisia (ISO 3166 trigram)
TUNS,Technical University of Nova Scotia
TUR,Turkey (ISO 3166 trigram)
TUSK,Tank Urban Survival Kit
TUV,Tuvalu (ISO 3166 trigram)
TV,"Television,Teravolt,Transvestite,Tuvalu (ISO 3166 and FIPS 10-4 country code digram)"
Tv,"Time value,a designation seen on some camera dials for shutter priority mode"
TVA,Tennessee Valley Authority
TVG,"Television Games (Network),Tick,Very Good,Often used by School Teachers when marking homework etc. (Tick VG)[1][2]"
TVR,TreVor (Wilkinson) Racing
TVS,Tornado vortex signature
TW,"Republic of China (Taiwan) (ISO 3166 and FIPS 10-4 country code digram),Terawatt"
TWAIN,Technology Without An Interesting Name
TWE,Trans World Entertainment
TWI,The Welding Institute
TWIP,"Take What Insurance Pays,When a surgeon agrees to accept a lower payment than he ordinarily would for a procedure and not charge the patient the difference"
TWN,Republic of China (Taiwan) (ISO 3166 trigram)
TWP,Technical Working Paper
TWS,"Thermal Weapon Sight,Track While Scan"
TX,"Texas (postal symbol),Transmit,Turkmenistan (FIPS 10-4 country code)"
TXV,Thermostatic Expansion Valve
TYT,"Take Your Time,Internet chat abbreviation"
TZ,Tanzania (ISO 3166 and FIPS 10-4 country code digram)
TZA,Tanzania (ISO 3166 trigram)
TZC,Tetrazolium chloride
U,Uranium
UA,Ukraine (ISO 3166 digram)  Unit of Action
UAAP,University Athletic Association of the Philippines
UAB,University of Alabama at Birmingham
UAE,United Arab Emirates (also IOC and FIFA trigram,but not ISO 3166)
UAR,"Uniformly At Random (probability),Unión Argentina de Rugby (Spanish for "Argentine Rugby Union"),United Arab Republic"
UAV,"Unmanned Aerial Vehicle,Unprotected Anal and Vaginal sex,UB[edit]"
UBC,"United Baptist Church,University of British Columbia"
UBIGEO,Ubicación Geografica (Spanish for Geographical Location)
UBS,"Unbundled Bitstream Services,United Bank of Switzerland,United Banque Suisse"
UCBSA,United Cricket Board of South Africa
UCF,University of Central Florida
UCI,"Union Cycliste Internationale (French,"International Cycling Union"),University of California,Irvine"
UCLA,"University of California at Los Angeles"
UCLES,University of Cambridge Local Examinations Syndicate
UCR,"University of California at Riverside"
UCR,University of Costa Rica
UCS,Union of Concerned Scientists
UCSB,"University of California at Santa Barbara"
UCSD,"University of California at San Diego"
UDAS,Uppsala-DLR Asteroid Survey
UDDI,"Universal Description,Discovery and Integration"
UDTS,Uppsala-DLR Trojan Survey
UE,Unit of Employment
UEFA,Union of European Football Associations
UESAC,Uppsala-ESO Survey of Asteroids and Comets
UFC,Ultimate Fighting Championship
UFO,"Unidentified Flying Object, or: United Farmers of Ontario"
UG,Uganda (ISO 3166 and FIPS 10-4 country code digram)
UGA,Uganda (ISO 3166 trigram)
UGV,Unmanned Ground Vehicle
UHF,Ultra High Frequency
UHMW,Ultra-High Molecular Weight
UHRB,Ultra-High Resolution Building (simulation)
UIC,University of Illinois at Chicago
UID,User ID
UIL,University Interscholastic League (governing body for most interscholastic activities,notably sports,in Texas public high schools)
UIUC,University of Illinois at Urbana-Champaign
UJTL,Universal Joint Task List
UK,United Kingdom (also FIPS 10-4 country code),University of Kentucky
UKIP,United Kingdom Independence Party
UKR,Ukraine (ISO 3166 trigram)
UL,Underwriters Laboratories
ULEB,Union des ligues européens de basket-ball,French for "Union of European Basketball Leagues"
ULF,Ultra Low Frequency
UM,U.S. Minor Outlying Islands (postal symbol; ISO 3166 digram)
UMBC,University of Maryland,Baltimore County
UMC,United Microelectronics Corporation,University of Missouri-Columbia
UMCP,Unit Maintenance Collection Point
UMES,University of Maryland Eastern Shore
UMI,U.S. Minor Outlying Islands (ISO 3166 trigram)
UMIST,University of Manchester Institute of Science and Technology
UMK,Uniwersytet Mikołaja Kopernika (Polish "Nicolaus Copernicus University")
UML,Unified Marxist-Leninist Communist Party of Nepal,Unified Modeling Language,University of Massachusetts Lowell,User-Mode Linux
UMTS,Universal Mobile Telecommunications System
UN,United Nations
UNABOM,University and airline bomber (FBI case name)
UNAIDS,(i/a) Joint United Nations Programme on HIV/AIDS
UNaM,(p/a) Universidad Nacional de Misiones (Spanish,"National University of Misiones")
UNAM,Universidad Nacional Autónoma de México (Spanish,"National Autonomous University of Mexico")
UNAMSIL,United Nations Mission in Sierra Leone
UNCF,United Negro College Fund
UNCLOS,United Nations Convention on the Law of the Sea
UNCSGN,United Nations Conference on the Standardization of Geographical Names
UNCTAD,United Nations Conference on Trade and Development
UNDCP,United Nations Drug Control Programme
UNDE,(i/a) Union of National Defence Employees (Canada)
UNDP,United Nations Development Programme
UNEP,United Nations Environment Programme
UNESCO,United Nations Educational,Scientific and Cultural Organization
UNFCCC,United Nations Framework Convention on Climate Change
UNFICYP,United Nations Peacekeeping Force in Cyprus
UNGEGN,United Nations Group of Experts on Geographical Names
UNHCR,United Nations High Commission (er) for Refugees
UNICEF,United Nations Children's Fund (originally the United Nations International Children's Emergency Fund)
UNICRI,United Nations Interregional Crime and Justice Research Institute
UNIDO,United Nations Industrial Development Organization
UNIFEM,United Nations Development Fund for Women (from the French Fonds de développement des Nations unies pour la femme)
UNIS,University of Surrey,Guildford,England
UNLV,University of Nevada,Las Vegas
UNMIK,United Nations Interim Administration Mission in Kosovo
UNMOVIC,United Nations Monitoring,Verification and Inspection Commission
UNOSOM,United Nations Operations in Somalia
UNPROFOR,United Nations Protection Force (in former Yugoslavia)
UNRISD,United Nations Research Institute for Social Development
UNSM,Union of Nova Scotian Municipalities
UNTAC,United Nations Transitional Authority in Cambodia
UNTAET,(i/a) United Nations Transitional Administration in East Timor
UNU,United Nations University
UP,Ukraine (FIPS 10-4 country code),Union Pacific Railroad (AAR reporting mark),Upper Peninsula (of Michigan),Uttar Pradesh
UPC,United Pentecostal Church,Universal Product Code
UPDM,Uganda People's Democratic Movement,Unified Modeling Language Profile for DoDAF and MoDAF,Unité de psychiatrie du développement mental,Universal Pattern Decomposition Method,Unix Power Device Management,Unpressurized Docking Mast,Urban Planning,Design and Management
UPdM,Università Popolare della Multimedialità
UPF,Universitat Pompeu Fabra (Catalan,"Pompeu Fabra University")
UPI,United Press International
UPN,United Paramount Network
UPS,Uninterruptible Power Supply,United Parcel Service
UPTN,Universal Personal Telecommunications Number,Upper Peninsula Telehealth Network
UPU,Universal Postal Union
UR,Soviet Union (NATO country code,obsolete 1992)
URBSFA,Union royale belge des sociétés de football association (French for Royal Belgian Football Association)
URD,User Requirements Document
URI,Uniform Resource Identifier,University of Rhode Island
URL, Uniform Resource Locator ("earl")
URU,Uruguay (IOC and FIFA trigram,but not ISO 3166)
URY,Uruguay (ISO 3166 trigram)
US,United States (also ISO 3166 and FIPS 10-4 country code digram)
USA,United States of America (also ISO 3166 trigram),United States Army
USAADAC,U.S. Army Air Defense Artillery Center,Fort Bliss,Texas
USAARMC,U.S. Army ARMor Center,Fort Knox,Kentucky
USAAVNC,U.S. Army AViatioN Center,Fort Rucker,Alabama
USAF,United States Air Force
USAFSPC,U.S. Air Force Space Command
USAIC,U.S. Army Infantry Center,U.S. Army Intelligence Center
USAID, United States Agency for International Development
USAP,Union Sportive des Arlequins Perpignanais,United States Antarctic Program
USAPATRIOT,Uniting and Strengthening America by Providing Appropriate Tools Required to Intercept and Obstruct Terrorism
USAREUR,United States Army Europe
USB,Universal Serial Bus
USC,United States Code,University of South Carolina,University of Southern California
USCG,United States Coast Guard
USCINCSPACE,United States Commander in Chief,Space Command
USDA,United States Department of Agriculture
USDI,United States Department of the Interior
USDOE,United States Department of Energy
USDRE,(U.S.) Under-Secretary of Defense for Research and Engineering (1978-1986)
USEC,United States Enrichment Corporation
USFL,United States Football League
USFWS,United States Fish and Wildlife Service
USGS,United States Geological Survey
USIA,United States Information Agency
USJFCOM,United States Joint Forces Command
USL,United Soccer League,a third-level U.S. league. Not to be confused with an earlier league of the same name.,United Soccer Leagues,the organization that operates the above league,plus several other lower-level leagues,University of Southwestern Louisiana,a former name for the school now known as the University of Louisiana at Lafayette
USMC,United States Marine Corps
USMNT,United States men's national (soccer) team
USN,United States Navy
USNA,United States National Arboretum,United States Naval Academy
USNB,United States Naval Base
USNG,United States National Grid
USNH,United States Naval Hospital
USNI,United States Naval Institute
USNO,U.S. Naval Observatory
USNOFS,United States Naval Observatory Flagstaff Station
USNP,United States Newspaper Program
USNR,United States Navy Reserve
USNS,United States Naval Ship
USNY,University of the State of New York (usually pronounced "use-knee")
USNZ,University Sport New Zealand
USPS,United States Postal Service
USPTO,United States Patent and Trademark Office
USR,Universal System Resources (/usr,directory in a *NIX filesystem),User
USS,United States ship (sometimes meaningless; see Star Trek)
USSPACECOM,United States Space Command
USSR,Union of Soviet Socialist Republics
UST,Underground Storage Tank
USTRANSCOM,United States Transportation Command
USWNT,United States women's national (soccer) team
UT,Universal Time
UTEP, University of Texas at El Paso (pronounced you-tep)
UTM,Universal Transverse Mercator (geographical co-ordinate system)
UU,Unitarian Universalism,University of Utah,Unseen University
UUA,Unitarian Universalist Association
UUID,Universally Unique Identifier (see also GUID)
UUV,Unmanned Underwater Vehicle
UV,Burkina Faso (FIPS 10-4 country code; from Upper Volta),ultraviolet
UVM,Universal Verification Methodology,Universidad del Valle de México,University of Vermont,from its Latin name of Universitas Viridis Montis ("University of the Green Mountains"),UV mapping,UW[edit]
UW,University of Washington
UWO,University of Western Ontario
UWT,Under Water Telephone
UWTG,Under Water Tug
UWW,United World Wrestling
UXO,Unexploded Ordnance
UY,Uruguay (ISO 3166 and FIPS 10-4 country code digram)
UZ,Uzbekistan (ISO 3166 and FIPS 10-4 country code digram)
UZB,Uzbekistan (ISO 3166 trigram)
V,5 (in Roman numerals),Vanadium,Volt
VA,Vatican City-State (ISO 3166 digram),Veterans Affairs (U.S. Department of),Virginia (postal symbol),Various Artists
VACIS,Vehicle And Container Inspection System
VACIS,Victorian Ambulance Clinical Information System
VANOS,Variable Nockenwelle System
VAO,Vienna Art Orchestra
VAT,Value-Added Tax,Vatican City-State (ISO 3166 trigram)
VB,Victoria Bitter (beer),Visual Basic
VBA,Visual Basic for Applications
VC,Saint Vincent and the Grenadines (FIPS 10-4 country code; ISO 3166 digram),Victoria Cross
VCDS,(Canada) Vice-Chief of the Defence Staff,VAG-COM Diagnostic System
VCJCS,Vice Chairman,Joint Chiefs of Staff
vCJD,Variant Creutzfeldt-Jakob Disease
VCNO,(U.S.) Vice Chief of Naval Operations
VCofS,Vice Chief of Staff
VCR,Video cassette recorder
VCT,Saint Vincent and the Grenadines (ISO 3166 trigram)
VD,North Vietnam (ISO 3166 digram,obsolete 1977),Venereal Disease
VDFS,VisualSVN Distributed File System (VDFS)
VDMOS,(i/a) Vertical Double-diffused MOS transistor ("vee-dee-moss")
VDOT,(i/a) Virginia Department of Transportation ("vee-dot")
VDR,North Vietnam (ISO 3166 trigram,obsolete 1977)
VE,Venezuela (FIPS 10-4 country code; ISO 3166 digram)
VEEGA,Venus Earth Earth Gravity Assist manœuvre
VEN,Venezuela (ISO 3166 trigram)
VERDI,Vittorio Emanuele Re D'Italia (Victor Emmanuel,King of Italy)
VERITAS,Very Energetic Radiation Imaging Telescope Array System
VFA,Victorian Football Association (historic Australian rules football league),Volatile Fatty Acid
VfD,s for deletion (used in Wikipedia)
VFL,Victorian Football League,the name of two distinct Australian rules football leagues:
VFM,Value For Money
VFMO,Very Fast Moving Object (astronomy)
VFT,Virtual Function Table
VFW,Veterans of Foreign Wars
VG,British Virgin Islands (ISO 3166 digram)
VGB,British Virgin Islands (ISO 3166 trigram)
VH1, Video Hits One
VHF,Very High Frequency
VI,6 (in Roman numerals),British Virgin Islands (FIPS 10-4 territory code),U.S. Virgin Islands (postal symbol; ISO 3166 digram),vide infra (Latin,"see below"),Virtual Instrument (LabVIEW)
VIA,Versatile Interface Adapter
VIC,Victoria,Australia (postal symbol),Video Interface Chip,Virginia Intermont College
VIDS,Visual Information Display System
VII,7 (in Roman numerals)
VIII,8 (in Roman numerals)
VIN,(i/a) Vehicle Identification Number (ISO 3779)
VIP,Very Important Person
VIR,U.S. Virgin Islands (ISO 3166 trigram),Virgin Atlantic Airways (ICAO code)
VIS,Vavoua International School,Vienna Independent Shorts,Viewable Image Size,Visual Instruction Set
VISCII,VIetnamese Standard Code for Information Interchange
VIT,Vellore Institute of Technology
VIVO,Video In Video Out
VJ,Video Jockey
VK,Australia (ham radio code),Västerbottens-Kuriren,a Swedish daily newspaper
VLA,Very Large Array,(UK) Veterinary Laboratories Agency
VLAD, Vertical Line Array DIFAR
VLBA,Very Long Baseline Array
VLF,Very Low Frequency
VLIW,Very Long Instruction Word
VLPFC,VentroLateral PreFrontal Cortex
VLPMC,VentroLateral PreMotor Cortex
VLSF,Very Loud,Stink-Free
VLSI,Very-large-scale integration
VLVS,Very Loud,Very Stinky
VM,Vietnam (FIPS 10-4 country code)
VMASC,(i/a) Virginia Modeling Analysis & Simulation Center ("vee-mask")
VMF,Marine Fighting Squadron of the United States Marine Corps
VMF,Variable Message Format
VMN,VentroMedial Nucleus (neurophysiology)
VN,Vietnam (ISO 3166 digram)
VNIR,Visible and Near InfraRed
VNM,Vietnam (ISO 3166 trigram)
VNS,see entry
VOA,Voice of America
VOC,Vereenigde Oostindische Compagnie (Dutch East India Company),Volatile organic compounds
VOIP,Voice Over Internet Protocol
VOLT,Visual OpenType Layout Tool
Volvo,Swedish supplier of commercial vehicles owned by Ford Motor Company. "Volvo" means "I roll" in Latin.
VON,Victorian Order of Nurses
VOR,Voice of Russia
VOX,Voice Operated oscillator
VP, Vice-President ("veep")
VPN,Virtual Private Network
VQ,Vector Quantization,U.S. Virgin Islands (FIPS 10-4 territory code)
VR,Virtual Reality
VRSG,Virtual Reality Scene Generator
VS,Very Special (brandy grade),vide supra (Latin,"see above")
VSAT,Very Small Aperture Terminal ("vee-satt")
VSHORAD,Very Short Range Air Defence
VSO,Voluntary Services Overseas
VSOP,Variations séculaires des orbites planétaires (French,"Planetary Orbit Secular Variations"),Very Small Outline Package (integrated circuit),Very Superior Old Pale (brandy grade),VLBI Space Observatory Programme
VSR,Very Special Relativity
VT,Vatican City-State (FIPS 10-4 country code),Vermont (postal symbol),Video tape,Virginia Tech
VTC,Video Tele-Conference
VTEC,Variable valve Timing and Electronic lift Control
VTOL,Vertical Take-Off & Landing
VU,Vanuatu (ISO 3166 digram),Vedanta University
VUB,Vrije Universiteit Brussel (Belgian university)
VUT,Vanuatu (ISO 3166 trigram)
VV,Via Voice,Village Voice
VVAF,Vietnam Veterans of America Foundation
VW,Volkswagen
VZ,Verizon Communications (NYSE code)
vzw,vereniging zonder winstoogmerk (Dutch "non-profit organisation")
W,Tungsten (from German Wolfram),Watt,West
W3C,World Wide Web Consortium
WA,Namibia (FIPS 10-4 country code; from West Africa),Washington state (postal symbol),Western Australia (postal symbol),World Archery (Federation)
WAAC,Women's Army Auxiliary Corps (Britain) (World War I UK)
WAAF,Women's Auxiliary Air Force (World War II UK)
WAC,Western Athletic Conference,Women's Auxiliary Corps (World War II Canada),Women's Army Corps (World War II U.S.)
WACC,Weighted Average Cost of Capital (accounting)
WACS,What-A-Cartoon! Show
WAD,Weapons Alert Designator
WAGGGS,World Association of Girl Guides and Girl Scouts
WAGs,Wives And Girlfriends (most notably of England national football team players at the 2006 FIFA World Cup,although the term existed earlier)
WAK,Wake Island (ISO 3166 trigram,obsolete 1986)
WAL,see entry
WAN,Wide area network
WAP,Wireless Application Protocol
WAPIMA,What a pain in my ass
WAR,With All Respect
WAsP,Short form of WAAAAP (Wind Atlas Analysis and Application Program)
WASP,White Anglo-Saxon Protestant,Wide Angle Search for Planets,Women Airforce Service Pilots
WAYP,White And Yellow Pages
WB,Warner Bros.,Welcome Back (Internet shorthand)
Wb,Weber
WBA,Warner Bros. Animation,West Bromwich Albion (F.C.),World Boxing Association
WBC,World Boxing Council
WBE,Work Breakdown Element
WBO,World Boxing Organization
WC,Water Closet,Winston Churchill,World Cup (sports)
WCBO,World Chess Boxing Organisation
WCBP,World Center for Birds of Prey
WCL,World Confederation of Labour
WCS,Weapon Control Status,Wildlife Conservation Society
WCW,World Championship Wrestling
WDC,Western Design Center,World Data Center
WDIN,Wildlife Disease Information Node
WDWR,Walt Disney World Resort
WEBS,Weapon Effectiveness Battle Simulation
WEC,World Extreme Cagefighting
WEEE,Waste Electrical and Electronic Equipment
WEF,World Economic Forum
WEM,West Edmonton Mall
WEU,Western European Union
WEZ, Weapon Engagement Zone
WF,Wallis and Futuna Islands (ISO 3166 digram)
WFC,Women's Forage Corps (World War II UK)
WFD,Weapon of Focused Destruction
WFF,Wallops Flight Facility
WFI,Water for Injection
WFP,World Food Program
WFZ,Weapons Free Zone
WG,Working Group,Wade-Giles
WH,Wehrmacht Heer (German World War II army vehicle licence plate code)
WHAM,Wisconsin Hydrogen-Alpha Mapping (telescope)
WHI,Women's Health Initiative
WHIP,Walks plus hits per inning pitched
WHO,World Health Organisation
WHS,(U.S.) Washington Headquarters Services
WI,Western Sahara (FIPS 10-4 country code),Wisconsin (postal symbol),Women's Institute
WIA,Wounded In Action,Wireless Institute of Australia (Amateur Radio)
WIIFM,What's in it for me?
WIMP,Weakly Interacting Massive Particle,Windows,Icons,Menus,Pointers
WIP,Work In Progress
WIPO, World Intellectual Property Organization
WIPP,[Nuclear] Waste Isolation Pilot Plant
WIYN,Wisconsin Indiana Yale NOAO telescope consortium
WK,Wake Island (ISO 3166 digram,obsolete 1986)
WKYP,Will Keep You Posted
WL,Wehrmacht Luftwaffe (German World War II air force vehicle licence plate code)
WLB,Women's Land Brigade (World War II Canada)
WLF,Wallis and Futuna Islands (ISO 3166 trigram)
WLOG,Without Loss Of Generality (see WOLOG)
WM,Wehrmacht Marine (German World War II navy vehicle licence plate code)
WMANUS,West Midlands Area National Union of Students
WMD,World Movement for Democracy
WMI,Wildlife Management Institute
WMO,World Meteorological Organization
WNA,World Nuclear Association
WNF,"Will Not Fix"
WNIT,Women's National Invitation Tournament
WNL,Medical initialism for "Within Normal Limits"
WNSD,What's New,Scooby-Doo?
WNW,West North-West
WO,Warrant Officer
WOF,Width of Fabric
WOFT,Waste Of Fucking Time
WOFTAM,Waste Of Fucking Time And Money
WOI, Wheels Of Italy
WOM,Write Only Memory
WOS,Wilson Ornithological Society
WOSM,World Organization of the Scout Movement,Worldwide Oil Spill Model
WOT,Waste Of Time
WP,White Phosphorus (ammunition)
WPB,War Production Board during World War II
WPE,World Pork Expo
WPK,Wider Peacekeeping
WPT,World Poker Tour,World Premiere Toons
WR,Wide Receiver (football)
WRAC,Women's Royal Army Corps (World War II UK)
WRAIR,Walter Reed Army Institute of Research
WRBWWRM,"We  Best What We  Most"
WRC,World Rally Championship
WRC,World Religions Conference
WRNG,Warning
WRNS,Women's Royal Naval Service (World War II UK) (pronounced "wrens")
WRS,Worldwide Reference System
WRT,"With respect to",especially in fields such as Mathematics.
WRT,NHS Workforce Review Team
WRT,The Linksys routers whose model name start with 'WRT'
WRT,Third party firmware for the Linksys WRT routers and compatible models from other vendors.
WRT,Wallace Roberts & Todd,LLC (Urban Planning and Design)
WRT,Web Runtime (WRT) is a portable application framework developed by Nokia that allows the creation of widgets on the S60 Platform.
WRT,Wholesale,Trade,Retail sector,category in employment and economics statistics
WRT,Wireless Receiver/Transmitter ( computer networks/IT )
WRT,Wireless Ronin Technologies (digital signage)
WRT,World Rally Team
WRT,Writer Response Theory
WRVS,Women's Royal Voluntary Service,now only known by the acronym (UK)
WS,Samoa (ISO 3166 and FIPS 10-4 country code digram; from the country's former name of Western Samoa),Writer to the Signet (a Scottish solicitor)
WSC,Weapon System Catalogue
WSDL,Web Services Description Language
WSJ,(The) Wall Street Journal
WSL,White Star Line (shipping company),Women's Super League,used to describe England's top women's association football league and top women's rugby union competition,Workers' Socialist League (UK political party)
WSM,Samoa (ISO 3166 trigram; from Western Samoa),Winchester Short Magnum (family of rifle cartridges)
WSMR, White Sands Missile Range ("whiz-murr")
WSROC,Western Sydney Regional Organisation of Councils
WSSM,Winchester Super Short Magnum (family of rifle cartridges)
WSTC,Women Signallers Territorial Corps (World War II UK)
WSW,West South-West
WTB,Wales Tourism Board,Warenterminbörse Hannover
WTB,Want to Buy (a commonly used phrase in the online game "World of Warcraft")
WTC,World Trade Center
WTF,What the fuck?; also What a Terrible Failure (android)
WTFH,What The Fucking Hell
WTH,What the Hell
WTO,World Trade Organization
WTS,Want to Sell (a commonly used phrase in the online game "World of Warcraft")
WU,Wabash University,Washington University in St. Louis,Western Union,Windows Update,Work unit,WU Wien (German Wirtschaftsuniversität Wien,Vienna University of Economics and Business Administration)
WUBU2,What you been up to
WUU2,What you up to,Internet slang popular with teenagers.
WV,West Virginia (postal symbol)
WVA,World Veterinary Association
WVIAC,West Virginia Intercollegiate Athletic Conference
WVR,Women's Volunteer Reserve (World War II UK)
WVSC,Women's Volunteer Service Corps (World War II Canada)
WVU,West Virginia University
WVUIT,West Virginia University Institute of Technology (note,however,that the initialism is almost never used; the popular name of the school is "WVU Tech")
WW,see entry
WWE,World Wrestling Entertainment
WWF,World Wide Fund for Nature,from its original name of World Wildlife Fund,which remains the legal name in the U.S. and Canada,World Wrestling Federation
WWI,World War I
WWII,World War II
WWIII,World War III
WWJD,"What would Jesus do?"
WWS,Wheaton Warrenville South High School
WWV,Wagner-Werk-Verzeichnis (catalog of the works of Richard Wagner,and callsign of NIST's shortwave radio station in Fort Collins,Colorado)
WWWF,World Wide Wrestling Federation
WXO,Weather [Executive] Officer
WY,Wyoming (postal symbol)
WYSIWYG,What You See Is What You Get (pronounced "wizzy-wig". See entry for derived acronyms)
WYSIWYP,What You See Is What You Print / What You See Is What You Pay ("wizzy-whip")
WZ,Swaziland (FIPS 10-4 country code)
XBML,eXtended Business Modelling Language
XC,Ninety (in Roman numerals)
XCBL,XML Common Business Library
XD,Used in chatrooms or email for smiley face. X is the eyes; squinted D is the mouth; XD.
Xe,Xenon
XF,Automobile made by Jaguar,Truck made by DAF Trucks,IATA code for Vladivostok Air
XFA,XML Forms Architecture
XFC,Xtreme Fighting Championships
XFD,Fighter aircraft made by Douglas
Xfe,X File Explorer
XFF,X-Forwarded-For
XFG,Exfoliation glaucoma
XFH,1932 rototype U.S. Navy fighter aircraft made by Hall,X-ray fluorescence holography
XFN,XHTML Friends Network,
XFR,Automobile made by Jaguar
XFT,X FreeType interface library
XG,Automobile made by Hyundai
XGA,Extended Graphics Array
XGE,Xoreax Grid Engine,Signal for "I Surrender"
XGP,Extreme Game Player
XHR,eXtra high Image resolution,XMLHTTPRequest
XHTML,eXtensible Hypertext Markup Language
XI,Eleven (in Roman numerals)
XII,Twelve (in Roman numerals)
XIII,Thirteen (in Roman numerals)
XIV,Fourteen (in Roman numerals)
XIX,Nineteen (in Roman numerals)
XJ,Automobile made by Jaguar,Automobile made by Jeep
XJL,Amphibian aircraft made by Columbia,Automobile made by Jaguar
XJS,Automobile made by Jaguar
XK,Automobile made by Jaguar,Automobile made by Jeep,Kell blood group precursor
XKB,X keyboard extension
XKE,Automobile made by Jaguar
XKR,Automobile made by Jaguar
XL,eXtra Large,Forty (in Roman numerals)
XML,eXtensible Markup Language
XMSF,eXtensible Modelling and Simulation Framework
XN,Christian,Nordic Patent Institute
XNA,"X-No-Archive,Xeno Nucleic Acid"
XNC,X Northern Captain
XNS,Xerox Network Systems,Extensible Name Service,Christians
XNU,X is Not Unix
XO,Χριστιανός Ορθόδοξος (Xristianos Orthodoksos,Greek for "Eastern Orthodoxy"),eXecutive Officer,eXtra Old (brandy grade)
XP,eXperience Point (role-playing games)
XQJ,XQuery API for Java™
XRAY,X-Ray
XRML,eXtensible Rights Markup Language
XS,Xiaolin Showdown
XSL,eXtensible Style Language
XTMH,eXtreme Technology Multiprocessor Hyperlanguage
XUL,XML User Interface Language
XV,Fifteen (in Roman numerals)
XVI,Sixteen (in Roman numerals)
XVII,Seventeen (in Roman numerals)
XVIII,Eighteen (in Roman numerals)
XWB,(Airbus A350) "Extra Wide Body"
XWF,Xcitement Wrestling Federation
XX,Twenty (in Roman numerals)
XXX,Hardcore pornography (film rating),Thirty (in Roman numera
Xyl,Xylobium
XZN,Triple square screw driver
y,Yocto-
Y,Yotta,Yttrium
Y2K,Year Two Thousand
yA,Yoctoampere
YA,Yottaampere,Young Adult
Ya,Yottayear
YaBPr,Yet another Brother Pat rant
YABSLAG,Yet another boy singing like a girl
YAC, Youth-Adult Committee
YAFLA,Yet Another Five Letter Abbreviation
YAP,Young Aspiring Professional
YB,Youcef Benzouada (Southern Algerian name)
Yb,Ytterbium
yC,Yoctocoulomb
YC,Yottacoulomb
YD,People's Democratic Republic of Yemen (ISO 3166 digram,obsolete 1990)
YDS,Yosemite Decimal System (climbing)
YE,Yemen (ISO 3166 digram)
YEM,Yemen (ISO 3166 trigram)
yF,Yoctofarad
YF,Yottafarad
yg,Yoctogram
Yg,Yottagram
YGCO,Yamaneko Group of Comet Observers
Ygo,Yu-Gi-Oh!
yH,Yoctohenry
YH,Yottahenry
YHBT,You Have Been Trolled
YHIH1,You Heard It Here First (lowercase: yhih1,pronounced yi-hi)
YHII,You Have It Inside
YHS,Ya Hoor sur!
YI,Serbia and Montenegro (deprecated FIPS 10-4 country code,now RB (Serbia) and MJ (Montenegro))
Yi,Yobi
Yippie,Youth International Party + suffix
yJ,Yoctojoule
YJ,Yottajoule
yK,Yoctokelvin
YK,Yottakelvin
YKYFCW,You know you're from Christchurch when (post-earthquake joke)
yL,Yoctolitre
YL,Yottalitre
YM,Yemen (FIPS 10-4 country code),Your Magazine (originally Young Miss,later Young & Modern)
ym,Yoctometre
Ym,Yottametre
YMD,People's Democratic Republic of Yemen (ISO 3166 trigram,obsolete 1990)
YMMD,You Make My Day
YMMV,Your Mileage May Vary (adapted from EPA's automobile mileage estimates,used as an idiom to convey "results may vary"
yN,Yoctonewton
YN,Yottanewton
YO,former Yugoslavia (NATO country code,obsolete 1993)
YOLO,You Only Live Once
YPA,Yards per Pass Attempt (football statistic)
YPG,Yekîneyên Parastina Gel (Kurdish,"People's Protection Units" or "People's Defense Units")
YPIO,Your Problem Is Obvious
YPO,Young Presidents' Organization
ys,Yoctosecond
yS,Yoctosiemens
Ys,Yottasecond
YS,Yottasiemens
YSA,Single adult (LDS Church),Young Socialist Alliance,Youth Service America
YSI,Young Scots for Independence
YT,Mayotte (ISO 3166 digram),Yottatesla,Yukon Territory (postal symbol)
yT,Yoctotesla
YTD,Year-To-Date
YTM,Yield to Maturity
YTS,Youth Training Scheme
YTT,Yoshi Topsy-Turvy
YU,York University,former Yugoslavia (ISO 3166 digram,obsolete 2003)
YUG,former Yugoslavia (ISO 3166 trigram,obsolete 2003)
Yuppie,Young Urban Professional + suffix
yV,Yoctovolt
YV,Yottavolt
yW,Yoctowatt
YW,Yottawatt
YWMV,Your Wallet May Vary (to convey "our budgets are different as far as what is affordable / justifiable")
YYH,YuYu Hakusho
z,Zepto
Z,Zetta
ZA,South Africa (ISO 3166 digram),Zambia (FIPS 10-4 country code),Zettaampere
zA,Zeptoampere
ZAF,South Africa (ISO 3166 trigram)
ZAMS,Zero age main sequence
ZAS,Zylinder Abschaltung System
ZBT,Zero-Balance Transfer (accounting)
zC,Zeptocoulomb
ZC,Zettacoulomb
ZCM,(n) ZENworks Configuration Management
ZCMK,Zone Control Master Key
ZCU,Zimbabwe Cricket Union
\a,Atto-