PowerShell/data/abbr/general.csv

1	ABBR	MEANING
2	e.g.	'exempli gratia' in Latin, meaning: 'for example'
3	0D	obvious deed
4	1AM	Air Mechanic 1st Class
5	1D	One-Dimensional
6	2AM	Air Mechanic 2nd Class
7	2D	Two-dimensional
8	2LA	Two Letter Acronym
9	2Lt	2nd Lieutenant
10	3AM	Air Mechanic 3rd Class
11	3D	Three-Dimensional
12	3G	Third-generation mobile telephone system
13	3i	Investors In Industry (venture capitalists)
14	3M	Minnesota Mining and Manufacturing Company
15	4G	Fourth-generation mobile telephone system
16	4WD	Four-wheel drive
17	5D	Five-Dimensional
18	6D	Six-Dimensional
19	7D	Seven-Dimensional
20	8D	Eight-Dimensional
21	9D	Nine-Dimensional
22	A	Ampere
23	A/C	Air Conditioned/Conditioning
24	A10	Atlantic 10 Conference
25	A1C	Airman First Class
26	A4	European standard office paper size
27	aA	Attoampere
28	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)
29	AAAS	American Association for the Advancement of Science
30	AAAV	Advanced Amphibious Assault Vehicle
31	AADAC	Alberta Alcohol and Drug Abuse Commission
32	AADD	Adult attention deficit disorder
33	AADT	annual average daily traffic
34	AAFES	Army and Air Force Exchange Service
35	AAIS	advanced airborne interceptor simulator
36	AAM	air-to-air missile
37	AAMOF	as a matter of fact
38	AAN	American Academy of Nursing
39	AANEAS	Anglo-Australian Near-Earth Asteroid Survey
40	AAODL	Atmospheric Aerosols and Optics Data Library
41	AAPC	Accounting and Auditing Policy Committee
42	AARP	American Association of Retired Persons (now officially known only by the initials)
43	AASPEM	advanced air-to-air system performance evaluation model
44	AAT	Australian Antarctic Territory
45	AAV	Amphibious Assault Vehicle
46	AAWC	anti-air warfare commander
47	AB	Able Seaman (both the rank and the occupation),Alberta (postal symbol)
48	ABB	ASEA Brown Boveri (Swiss-Swedish multinational company)
49	ABBA	Agnetha,Benny,Björn,Anni-Frid (Swedish pop group)
50	ABC	the first three letters of the Latin script known as the alphabet
51	ABC	abstinence, be faithful, condoms
52	ABC	Active Body Control
53	ABC	airway, breathing, circulation
54	ABC	Alcoholic Beverage Commission
55	ABC	alien big cat
56	ABC	always be careful
57	ABC	American-born Chinese
58	ABC	anti-lock brake controller
59	ABC	atomic, biological, chemical
60	ABCS	(U.S.) Army Battle Command System
61	ABET	Accreditation Board for Engineering and Technology
62	ABFIST	Advanced Bradley Full Crew Interactive Skills Trainer
63	ABGI	Addington-Barker Group International
64	ABIN	Agência Brasileira de Inteligência (Brazilian Intelligence Agency)
65	ABL	American Basketball League
66	ABLE	AirBorne Law Enforcement (police air support unit)
67	ABMC	American Battle Monuments Commission
68	ABN	Australian Business Number (a number issued by the Australian government as registration of a business and used for taxation purposes)
69	ABPI	Association of the British Pharmaceutical Industry
70	ABRSM	Associated Board of the Royal Schools of Music
71	ABS	anti-lock braking system
72	ABSA	Amalgamated Banks of South Africa
73	ABSTRIPS	abstraction-based STRIPS
74	ABV	Alcohol by volume
75	ABW	Aruba (ISO 3166 trigram)
76	Ac	Actinium
77	AC	Adriamycin-Cyclophosphamide (chemotherapy),Air Conditioning,Aircraftman,Alternating Current,Altocumulus,ante Christum (Latin,'before Christ'; see BC),ante cibum (Latin,'before meals'),Associazione Calcio (Italian,'football (soccer) club')
78	aC	Attocoulomb
79	AC1	Aircraftman 1st Class
80	AC2	Aircraftman 2nd Class
81	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
82	ACARS	Aircraft Communications Addressing and Reporting System
83	ACB	Asociación de Clubes de Baloncesto (Spanish for 'Association of Basketball Clubs')
84	ACCAC	Awdurdod Cymwysterau,Cwricwlwm ac Asesu Cymru (Qualifications,Curriculum and Assessment Authority for Wales)
85	ACCD	American Coalition of Citizens with Disabilities
86	ACCS	Air Communications and Control Squadron
87	ACDA	Arms Control & Disarmament Agency
88	ACDC	Alternating Current Direct Current,the name of an Australian rock music band,a term for a bisexual person,A/Cdre,Air Commodore
89	ACDT	Apple Certified Desktop Technician,Australian Central Daylight Time
90	ACES	Aerolíneas Centrales de Colombia (Spanish,'Central Colombian Airlines'),Auxiliary Campus Enterprises and Services of Alfred State College
91	ACF	Administration for Children and Families,American Car and Foundry,American Culinary Federation
92	ACHT	Average Call Hold Time
93	ACINT	Acoustic Intelligence
94	ACK	Acknowledge (telecommunications; cf. NAK)
95	ACL	Access Control List,Anterior cruciate ligament; the initialism can also refer to an injury to this ligament.,Atlantic Coast Line Railroad
96	ACLJ	American Center for Law and Justice
97	ACLOS	Automatic CLOS (missile control system)
98	ACLS	American Council of Learned Societies
99	ACLU	American Civil Liberties Union,American Communist Lawyers Union (pejorative slang for the above)
100	ACM	many,including Association for Computing Machinery; see entry
101	ACMC	(U.S.) Assistant Commandant of the Marine Corps
102	ACN	Airborne Communications Node,Australian Company Number (number issued by the Australian government as registration of a limited liability company)
103	ACNA	Anglican Church in North America
104	ACO	Airspace Control Order
105	ACOBA	Advisory Committee on Business Appointments
106	ACOG	American College of Obstetricians and Gynecologists
107	ACOM	(U.S.) Atlantic Command
108	ACORN	Association of Community Organizations for Reform Now
109	ACP	African,Caribbean and Pacific Group of States,Air Control Point
110	ACR	Advanced Concepts and Requirements
111	ACRI	African Crisis Initiative
112	ACRT	Advanced Concepts Research Tool simulator
113	ACS	Affiliated Computer Services (NYSE ACS),Alaska Communications Service,American Cancer Society,American Chemical Society,Association of Caribbean States,Australian Computer Society
114	ACSC	Army Command and Staff College (various nations)
115	ACST	American Cooperative School of Tunis
116	ACST	Australian Central Standard Time
117	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
118	ACTD	Advanced Concept Technology Demonstration
119	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)
120	ACTU	Australian Council of Trade Unions
121	ACU	American Conservative Union
122	ACUF	Advisory Committee on Undersea Features,American Conservative Union Foundation
123	AD	Anno Domini (Latin for 'In the year of our Lord')
124	ADA	Air Defence Artillery,American Dental Association,Assistant District Attorney,Americans with Disabilities Act (see also the similar but non-acronymic Ada programming language)
125	ADAC	Allgemeiner Deutscher Automobil-Club (German for 'General German Automobile Club')
126	ADAGE	Air Defense Air to Ground Engagement (simulation)
127	ADAP	AIDS Drug Assistance Program
128	ADAS	Asiago-DLR Asteroid Survey
129	ADAT	Alesis Digital Audio Tape (recording format)
130	ADATS	Agricultural Development and Training Society,Air Defence Anti-Tank System,Australian Defence Air Traffic System
131	ADB	Asian Development Bank
132	ADC	Aide De Camp,U.S. Air Defense Command (1946-1992),Apple Display Connector,Program Against Digital Counterfeiting of Currency
133	ADD	Analog Digital Digital (CD quality),Attention-Deficit Disorder,Administration on Developmental Disabilities
134	ADDIE	Analyze Design Develop Implement and Evaluate
135	ADDNS	Advanced Deployable Day/Night Simulation
136	ADGB	Air Defence of Great Britain
137	ADHD	Attention-Deficit Hyperactivity Disorder
138	ADHS	Attention-Deficit Hyperactivity Syndrome
139	ADI	Acceptable/Allowable Daily Intake
140	ADL	Anti-Defamation League
141	ADM	Administrative,,Admiral,and the U.S. Public Health Service Commissioned Corps,Archer Daniels Midland,Assistant Deputy Minister
142	ADOA	Air Defence Operations Area
143	ADP	Adenosine DiPhosphate,Army Doctrine Publication (UK,Canada,Australia),Automatic/Automated Data Processing
144	ADRG	Arc-second Raster Chart (ARC) Digitized Raster Graphics
145	ADS	Active Denial System, Astrophysics Data System, Attention Deficit Syndrome
146	ADSR	Attack,Decay,Sustain,Release (sound envelope specification)
147	ADT	Atlantic Daylight Time (UTC−3 hours)
148	ADTB	Army Doctrine and Training Bulletin
149	ADW	Air Defence Warning
150	AE	Armed Forces Africa/Canada/Europe/Middle East (postal symbol),United Arab Emirates (ISO 3166 digram),Artix Entertainment,American Eagle,A&E, Arts & Entertainment Network,the original name for the U.S. TV channel now known as A&E Network
151	AEDT	Australian Eastern Daylight Time
152	AEF	American Expeditionary Force
153	AEGIS	Airborne Early warning Ground environment Interface Segment (fake etymology)
154	AESR	Aeronautical Equipment Service Record
155	AEST	Australian Eastern Standard Time
156	aet	After extra time (Football)
157	AEW	Airborne Early Warning,Airborne Electronic Warfare
158	AF	Afghanistan (ISO 3166 digram),Air Force,As f*ck
159	aF	Attofarad
160	AFA	U.S. Air Force Academy,Asociación del Fútbol Argentino (Spanish for 'Argentine Football Association')
161	AFAIC	As Far As I'm Concerned
162	AFAICT	As Far As I Can Tell
163	AFAIK	As Far As I Know
164	AFAIR	As Far As I Remember/Recall
165	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
166	AFATDS	Advanced Field Artillery Tactical Data System
167	AFCEA	Armed Forces Communications and Electronics Association
168	AFDB	African Development Bank
169	AFES	Automatic Fire Extinguishing System
170	AFG	Afghanistan (ISO 3166 trigram)
171	AFI	French Territory of the Afars and Issas (ISO 3166 trigram; obsolete since 1977),'Agencia Federal de Investigaciónes' (México)
172	AFIST	Abrams Full Crew Interactive Skills Trainer
173	AFJ	April Fool's Joke
174	AFK	Away From Keyboard (Internet chat abbreviation)
175	AFLAC	American Family Life Assurance Company of Columbus
176	AFO	Association of Field Ornithologists
177	AFOSR	U.S. Air Force Office of Scientific Research
178	AFP	Agence France-Presse (French,'French Press Agency'), Australian Federal Police
179	AFQT	Armed Forces Qualification Test
180	AFRC	Air Force Reserve Command
181	AFRL	Air Force Research Laboratory
182	AFROTC	Air Force Reserve Officer Training Corps
183	AFRRI	(U.S.) Armed Forces Radiobiology Research Institute
184	AFRTS	Armed Forces Radio and Television Service
185	AFSC	U.S. Air Force Staff College (obsolete; replaced with JFSC), U.S. Air Force Systems Command
186	AFSCN	U.S. Air Force Satellite Control Network
187	AFSPC	Air Force Space Command
188	AFT	American Farmland Trust
189	AFV	armoured fighting vehicle
190	AG	air gunner,Aktiengesellschaft (German,'incorporated'),Antigua and Barbuda (ISO 3166 digram),Assemblies of God
191	ag	Attogram
192	Ag	Silver (Latin for 'argentum')
193	AGA	AB Gas-accumulator ('ah-gah',Swedish company),Advanced Graphics Architecture
194	AGARD	Advisory Group for Aerospace Research and Development
195	AGARDograph	Advanced Guidance for Alliance Research and Development publication
196	AGASA	Akeno Giant Air Shower Array (cosmic ray detector)
197	AGB	Internal Nintendo initialism (Advanced Game Boy) for Game Boy Advance
198	AGC	Adjutant General's Corps (British Army)
199	AGDC	Australian Game Developers' Conference
200	AGI	Auxiliary Group Intelligence
201	AGM	Annual General Meeting
202	AGN	Active Galactic Nucleus
203	AGO	Angola (ISO 3166 trigram)
204	AGP	Accelerated Graphics Port
205	AGRICOLA	Agriculture Online Access
206	AGS	Alaska Ground Station (LandSat)
207	AGTS	Advanced Gunnery Training System
208	AGU	American Geophysical Union
209	AGW	Autonomous Guided Weapon
210	Ah	Ampere-hour
211	AH	Attack Helicopter
212	aH	Attohenry
213	AHA	American Heart Association
214	AHCPR	Agency for Health Care Policy and Research (obsolete; replaced with AHRQ)
215	AHEC	Australian Health Ethics Committee
216	AHPCRC	Army High Performance Computing Research Center
217	AHQ	Air Headquarters
218	AHRQ	Agency for Healthcare Research and Quality
219	AHS	American Housing Survey
220	AI	Air Interdiction,Amnesty International,Artificial Insemination,Artificial Intelligence,Anguilla (ISO 3166 digram)
221	AIA	Aerospace Industries Association,American Institute of Architects,Anguilla (ISO 3166 trigram)
222	AIAA	American Institute of Aeronautics and Astronautics
223	AIC	African Independent Church,Animal Identification Coordinator
224	AICD	Australian Institute of Company Directors
225	AICMFP	And I Claim My Five Pounds
226	AID	U.S. Agency for International Development
227	AIDS	Acquired Immune Deficiency Syndrome
228	AIM	Australian Institute of Management
229	AIMP	Aurora Incremental Modernization Project
230	AIPAC	American Israel Public Affairs Committee
231	AIR	Aircraft Inventory Record
232	AIRFA	American Indian Religious Freedom Act
233	AIRS	Aerometric Information Retrieval System (obsolete; replaced with AFS)
234	AIS	Australian Institute of Sport,Automatic Identification System
235	AISB	(British Society for the Study of) Artificial Intelligence and the Simulation of Behaviour
236	aJ	Attojoule
237	Ajax	Asynchronous JavaScript And XML
238	AJD	Astronomical Julian day
239	AJP	Allied Joint Publication
240	AJPW	All Japan Pro Wrestling
241	AK	Alaska (postal symbol)
242	aK	Attokelvin
243	AKA	Above knee amputation (orthopaedic usage)
244	AKDT	Alaska Standard Daylight Saving Time (UTC−8 hours)
245	AKP	Adalet ve Kalkınma Partisi (Turkish,'Justice and Development Party')
246	AKST	Alaska Standard Time (UTC−9 hours)
247	AL	Alabama (postal symbol),Albania (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)
248	Al	Aluminium
249	aL	Attolitre
250	ALA	Åland Islands (ISO 3166 trigram)
251	ALAP	As Long/Late As Possible
252	ALARM	Air-Launched Anti-Radar Missile
253	ALB	Albania (ISO 3166 trigram)
254	ALD	Accounting Line Designator (nuclear weapon targeting)
255	ALERT	Advanced Linked Extended Reconnaissance and Targeting,Attack and Launch Early Reporting to Theatre
256	ALF	Africa Leadership Forum,Alien Life Form (cf. ALF (TV series)),Animal Liberation Front
257	ALG	Algeria (IOC and FIFA trigram,but not ISO 3166)
258	ALGOL	ALGOrithmic Language
259	ALPA	Air Line Pilots Association
260	ALS	Amyotrophic Lateral Sclerosis
261	ALSHS	Abraham Low Self-Help Systems
262	ALSP	Aggregate Level Simulation Protocol
263	ALTE	Association of Language Testers in Europe
264	Am	Americium
265	AM	Amplitude Modulation and Ante Meridiem; see entry,Armenia (ISO 3166 digram)
266	AM1	Airman 1st class
267	AMCB	U.S. Army/Marine Corps Board
268	AMFOM	Advanced Missile Fly Out Model
269	AMFR	Age-specific Marital Fertility Rate,Amplitude Modulation Following Response
270	AMFRS	Advanced Multi-Function Radio Frequency System,Automatic Multisensor Feature-based Recognition System
271	AML	Acute Myeloid Leukaemia
272	AMLCD	Active Matrix Liquid Crystal Display
273	AMLO	Andrés Manuel López Obrador (Mexican politician),Anti-Money Laundering Office (Thailand government agency)
274	AMO	Atlantic Multidecadal Oscillation
275	AMOLED	Active-matrix organic light-emitting diode
276	AMOS	Advanced MOrtar System,Air Force Maui Optical and Supercomputing observatory
277	AMP	Adenosine MonoPhosphate,Automated Mission Planner
278	AMRAAM	Advanced Medium-Range Air-to-Air Missile
279	AMRDEC	U.S. Aviation & Missile Research,Development,& Engineering Center
280	AMS	Agriculture Marketing Service,American Mathematical Society
281	AMSAA	U.S. Army Materiel Systems Analysis Activity
282	AMSO	U.S. Army Model and Simulation Office
283	AMSU	Advanced Microwave Sounding Unit
284	AMTE	UK Admiralty Marine Technology Establishment (1977-1984)
285	AN	Netherlands Antilles (ISO 3166 digram)
286	aN	Attonewton
287	ANA	Administration for Native Americans,Afghan National Army,All Nippon Airways,Anti-Nuclear Anti-body,Australian National Airways,Australian Natives' Association
288	ANC	African National Congress
289	AND	Andorra (ISO 3166 trigram)
290	ANFO	Ammonium nitrate/fuel oil (explosive)
291	ANGLiCo	Air/Naval Gunfire Liaison Company
292	ANL	Argonne National Laboratory
293	ANM	Acoustic Noise Monitor
294	ANOVA	ANalysis Of VAriance
295	ANS	Applied and Natural Sciences
296	ANSI	American National Standards Institute
297	ANT	Netherlands Antilles (ISO 3166 trigram),Antigua and Barbuda (IOC trigram,but not ISO 3166 or FIFA)
298	ANTM	America's Next Top Model
299	ANTY	Acronyms,No Thank You
300	ANWR	Arctic National Wildlife Refuge /ˈænwɑr/
301	ANZ	Australia and New Zealand Banking Group
302	ANZAC	Australian and New Zealand Army Corps
303	AO	Angola (ISO 3166 digram),Approach Officer (submarine),Area of Operations
304	AOC	Air Operations Centre,Air Officer Commanding
305	AOD	Adrenalin O.D. (punk rock band)
306	AOI	Angle Of Incidence (Arab Organization for Industrialization)
307	AOL	America OnLine
308	AOR	Area of Responsibility
309	AOSTH	Adventures of Sonic the Hedgehog
310	AOTS	Attack of the Show!
311	AOU	American Ornithologists' Union
312	AP	Advanced Placement,Air Publication,Andhra Pradesh (Indian state code),Armed Forces Pacific (postal symbol),Associated Press,Auto Pilot
313	APB	All Points Bulletin (police jargon)
314	APEC	Asia Pacific Economic Cooperation
315	APEDS	AMSAA Performance Estimates Data System
316	APEX	Applied Physics Express
317	APHA	American Public Health Association
318	APHIS	Animal and Plant Health Inspection Service
319	APL	Acute Promyeloid Leukaemia,Anti-Personnel Landmine,Applied Physics Laboratory (Johns Hopkins University)
320	APOD	Aerial Port (Airport) Of Debarkation
321	APOE	Aerial Port (Airport) Of Embarkation
322	APOLLO	Apache Point Observatory Lunar Laser-ranging Operation
323	APP	Allied Procedural Publication
324	APR	Annual Percentage Rate
325	AQIM	Al-Qaeda in the Islamic Maghreb
326	AR	Argentina (ISO 3166 digram),Arkansas (postal symbol),Armour,Arunachal Pradesh (Indian state code)
327	Ar	Argon
328	ARAG	Advanced Research and Assessment Group
329	ARB	Administrative Review Board
330	ARBA	Army Review Boards Agency
331	ARCA	Automobile Racing Club of America
332	ARCENT	United States Army Central Command
333	ARDA	Advanced Research and Development Activity (became DTO 2006)
334	ARF	ASEAN Regional Forum
335	ARG	Argentina (ISO 3166 trigram)
336	ARH	Armed Reconnaissance Helicopter
337	ARNet	Acquisition Reform Network
338	ARP	Applied Research Programme
339	ARPA	Advanced Research Projects Agency
340	ARRC	ACE Rapid Reaction Corps
341	ARRF	Allied Rapid Reaction Force
342	ARRL	American Radio Relay League
343	ARSC	Arctic Region Supercomputing Center
344	ARSPACE	U.S. Army Space Command
345	ARTCC	Air Route Traffic Control Center
346	ARWG	Army Research Working Group
347	AS	ActionScript
348	AS	American Samoa (postal symbol; ISO 3166 digram),Assam / Asom (Indian state code)
349	As	Arsenic
350	aS	Attosiemens
351	ASA	AcetylSalicylic Acid,American Standards Association,Army Security Agency,Atlantic Southeast Airlines
352	ASAP	As Soon As Possible
353	ASARS	Advanced Synthetic Aperture Radar System,Airborne Search and Rescue System
354	asbl	association sans but lucratif (French 'Non-profit organisation')
355	ASBO	Anti-Social Behaviour Order
356	ASCAP	American Society of Composers,Authors,and Publishers
357	ASCC	Army Service Component Commander,Automatic Sequence Controlled Calculator,Air Standardization Coordinating Committee
358	ASCII	American Standard Code for Information Interchange
359	ASD	(U.S.) Assistant Secretary of Defense,autism spectrum disorder
360	ASDIC	Allied Submarine Detection Investigation Committee (Sonar)
361	ASEAN	Association of Southeast Asian Nations
362	ASFAR	Americans for a Society Free of Age Restrictions
363	ASG	Area Support Group
364	ASIC	Australian Securities and Investments Commission,Aviation Security Identification Card
365	ASICS	Anima sana in corpore sano (Latin for 'A sound mind in a sound body') (athletic shoe manufacturer)
366	ASIO	Australian Security Intelligence Organisation,Audio stream input output
367	ASIP	Advanced System Improvement Program,Army Stationing and Installation Plan,Application-specific instruction-set processor
368	ASL	Above Sea Level,American Sign Language (also known as Ameslan),'Age,Sex,Location?' (Internet slang)
369	ASM	Air-to-Surface Missile,American Samoa (ISO 3166 trigram),American Society for Metals,American Society for Microbiology
370	ASMB	American Society for Matrix Biology,Adult Swim Message Board
371	ASME	American Society of Mechanical Engineers,American Society of Magazine ors
372	ASMP	Air-Sol Moyenne Portée missile (French 'Medium-range air to surface'),Asymmetric multiprocessing
373	ASN	Associate of Science in Nursing
374	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
375	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
376	ASPI	Australian Strategic Policy Institute
377	ASR	Alkali-silica reaction,Anti Slip Regulation
378	ASRAAM	Advanced Short-Range Air-to-Air Missile
379	ASSC	Association for the Scientific Study of Consciousness
380	AST	Atlantic Standard Time (UTC−4 hours)
381	ASTIA	Armed Services Technical Information Agency
382	ASTM	American Society for Testing and Materials
383	ASTREA	Aerial Support To Regional Enforcement Agencies (sheriff's air support unit)
384	ASUW	AntiSUrface Warfare
385	ASVAB	Armed Services Vocational Aptitude Battery(taken by juniors in high school in the USA)
386	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)
387	ASW	AntiSubmarine Warfare
388	ASWORG	(U.S.) AntiSubmarine Warfare Operations Research Group
389	ASX	Advanced Stream Redirector,Australian Securities Exchange
390	AT	Anti-Tank,Austria (ISO 3166 digram),Advanced Technology (IBM Personal Computer/AT)
391	At	Astatine
392	aT	Attotesla
393	ATA	Advanced Technology Attachment (IBM Personal Computer),Afghan Transitional Authority,Allen Telescope Array,Antarctica (ISO 3166 trigram)
394	ATAC	Air Transportable Acoustic Communications
395	ATAPI	Advanced Technology Attachment Packet Interface
396	ATAT	Aiken Tactical Airsoft Team / Star Wars vehicle
397	ATB	Active Time Battle,British Antarctic Territory (ISO 3166 trigram; merged with AQ in 1979)
398	ATC	Air Training Corps, U.S. Air Transport Command (1942-1948), Athletic Trainer,Certified
399	ATESS	Aerospace and Telecommunications Engineering Support Squadron
400	ATF	French Southern Territories (ISO 3166 trigram),(U.S.) Bureau of Alcohol,Tobacco,Firearms and Explosives
401	ATG	Antigua and Barbuda (ISO 3166 and FIFA trigram)
402	ATGM	Anti-Tank Guided Missile
403	ATGW	Anti-Tank Guided Weapon
404	ATK	Attack
405	ATL	Atlanta,Georgia,the largest city and capital of Georgia
406	ATLAS	All-Terrain Lifter Army System,Assessment Tool for LAnd Systems
407	ATM	At The Moment
408	ATN	Dronning Maud Land (ISO 3166 trigram; merged with AQ in 1983)
409	ATO	Air Tasking Order,Australian Taxation Office
410	ATP	Adenosine TriPhosphate,Allied Tactical Publication,Ammunition Transfer Point
411	ATSD	(U.S.) Assistant Secretary of Defense
412	ATSDR	Agency for Toxic Substances and Disease Registry
413	ATV	All-Terrain Vehicle
414	ATWA	Air,Trees,Water,Animals
415	AU	African Union (was OAU before 2000),American University,Astronomical Unit,Australia (ISO 3166 digram)
416	Au	Gold (Latin 'Aurum')
417	AUC	Ab Urbe Condita / Anno Urbis Conditae (Latin for '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)
418	AUS	Australia (ISO 3166 trigram)
419	AUSCANNZUKUS	Australia,Canada,New Zealand,United Kingdom,United States (security designation)
420	Auslan	Australian Sign Language
421	AUT	Austria (ISO 3166 trigram)
422	AUTL	Army Universal Task List
423	AV	Audio-Visual,Aviation
424	Av	Aperture value (photographic mode)
425	aV	Attovolt
426	AVA	American Viticultural Area
427	AVB	Audio Video Bridging
428	AVDLR	Aviation Depot Level Repair
429	AVGP	Armoured Vehicle, General Purpose
430	AVIM	Aviation Intermediate Maintenance
431	AVLB	Armoured Vehicle Launched Body
432	AVM	Air Vice-Marshal, Arteriovenous malformation
433	AVO	Apprehended Violence Order
434	AVP	Arubaanse Volkspartij
435	AVP	Association of Volleyball Professionals
436	AVRE	Armoured Vehicle Royal Engineers
437	AVTB	Armoured Vehicle Test Bed,Aviation Test Bed
438	AVUM	Aviation Unit Maintenance
439	AVVO	Acute Vaginal Venereal Outbreak
440	AW	Aruba (ISO 3166 digram)
441	aW	Attowatt
442	AWA	American Wrestling Association
443	AWC	Air Warfare Centre
444	AWD	All Wheel Drive
445	AWE	Advanced Warfighting Experiment
446	AWP	Awaiting Parts (SM&R code)
447	AWSIM	Air Warfare SIMulation
448	AWST	Australian Western Standard Time
449	AWW	Above Water Warfare
450	AX	Åland Islands (ISO 3166 digram)
451	AXP	Ambulance eXchange Point
452	AYBABTU	All Your Base Are Belong To Us
453	AYU	As Yet Unknown
454	AZ	Arizona (postal symbol),Azerbaijan (ISO 3166 digram),Alkmaar Zaanstreek (Dutch football club)
455	AZE	Azerbaijan (ISO 3166 trigram)
456	AZUR	Actions en zone urbaine (French for: Urban Operations)
457	B2B	Business to Business
458	B2C	Business to Consumer
459	B2G	Business to Government
460	B2E	Business to Employee
461	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]
462	BB	Barbados (ISO 3166 digram),Boys' Brigade (Christian youth organization),Brigitte Bardot (actress),Bumblebee
463	BBB	Better Business Bureau,Blood-brain barrier
464	BBC	Breeding Bird Census,British Broadcasting Corporation,Bumper to Back of Cab (trucking measurement)
465	BBL	Be Back Later,Bird Banding Laboratory,British Basketball League
466	BBN	Bolt,Beranek and Newman
467	BBQ	Barbecue
468	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)
469	BBYO	B'nai B'rith Youth Organization
470	BC	Before Christ,Blind Copy (in emailers),Boston College,British Columbia (postal symbol)
471	BCA	Bachelor of Computer Application,Black Coaches & Administrators
472	BCC	Blind Carbon Copy
473	BCCI	Bank of Credit and Commerce International,Board of Control for Cricket in India,BCD , Binary-Coded Decimal
474	BEA	Banque extérieure d'Algérie,British European Airways (ancestor of British Airways),British Electricity Authority,bel
475	BEL	Belgium (ISO 3166 trigram)
476	BEN	Benin (ISO 3166 trigram)
477	BEO	Banquet Event Order
478	BERC	Business Environmental Resource Center
479	BER	Bit Error Rate
480	BH	Bahrain (ISO 3166 digram)
481	BHR	Bahrain (ISO 3166 trigram)
482	BNF	Backus-Naur Form (computing), British National Formulary
483	BNICE	Biological,Nuclear,Incendiary,Chemical,and Explosive Agents
484	BNP	British National Party,Banque Nationale de Paris,a predecessor to today's BNP Paribas
485	BNS	Bank of Nova Scotia
486	BNSF	Burlington Northern Santa Fe (also AAR reporting mark)
487	BO	Back Orifice,Biarritz Olympique (French rugby union club),Bolivia (ISO 3166 digram),Body odor
488	BOAC	British Overseas Airways Corporation (predecessor of British Airways)
489	BoAML	Bank of America Merrill Lynch
490	BOC	British Orthodontic Society, British Oxygen Company
491	BÖC	Blue Öyster Cult
492	BODMAS	Brackets,Orders,Division,Multiplication,Addition,Subtraction
493	BOFH	Bastard Operator From Hell
494	BOGA	Bend Over and Grab Ankles
495	BOGOF	Buy One,Get One Free
496	BOGs	Bunch of Guys
497	BOI	Balance Of Investment,Basis Of Issue
498	BOL	Bolivia (ISO 3166 trigram)
499	BOM	Base Object Model,Bill Of Materials,Block of the Month quilting term,Business opportunity meeting
500	BOPD	Barrel of Oil Per Day
501	BOS	Battlefield Operating System
502	BOT	Balance of Trade,Botswana (IOC and FIFA trigram,but not ISO 3166),Build Operate Transfer,Bank of Thailand,BP[edit]
503	BP	Battle Position,British Petroleum (today,BP does not officially stand for anything),Bp , Bishop,BPD , Bipolar Personality Disorder,BPM , Beats Per Minute,BPMo , Business Process Mobility
504	BPV	Battlefield Planning Visualization,Bovine papillomavirus
505	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)
506	BR	Brazil (ISO 3166 digram) ,Bihar (Indian state code),British Rail,Break Ranks (marching band term)
507	BRA	Brazil (ISO 3166 trigram)
508	BRAG	Bicycle Ride Across Georgia
509	BRASS	Breathe,Relax,Aim,Sight,Squeeze (acronym for using a rifle)
510	BRIC	Brazil, Russia, India, and China
511	BRICS	Brazil, Russia, India, China, and South Africa
512	BSA	Birmingham Small Arms (motorcycles company),Boy Scouts of America,Brigade Support Area
513	BSatCoP	Benjamin Sniddlegrass and the Cauldron of Penguins
514	BSE	Bovine Spongiform Encephalopathy (better known as mad cow disease)
515	BSN	Baloncesto Superior Nacional (Spanish,'National Superior Basketball'; top Puerto Rican league),Bank Simpanan Nasional (Malay,'National Savings Bank'; government-owned Malaysian bank)
516	BSNL	Bharat Sanchar Nigam Limited,Bachelor of Science in Nursing
517	BSoD	Blue Screen of Death (distinct from BSD)
518	BSP	Between-Show Promotion,Binary Space Partitioning,Board Support Package,British Standard Pipe (screw thread),Business-sponsored,Bone sialoprotein
519	BST	Binary search tree,Blended Sales Tax,Bovine somatotropin,British Summer Time
520	BSW	British Standard Whitworth (screw thread)
521	BSX	Bendigo Stock Exchange
522	BT	Baal teshuva (Hebrew,'master of repentance') ,used to describe a Jew who adopts Orthodox Judaism as an adult,Bathythermograph,Bhutan (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
523	Bt	Baronet,Bacillus thuringiensis
524	BTO	Built To Order
525	BTP	British Transport Police
526	BTR	Bronetransporter (БТР = Бронетранспортер '(Heavy) Armoured (Personnel) Transporter')
527	BTU	British Thermal Unit
528	BTW	By The Way
529	BU	Burma (ISO 3166 digram; obsolete since 1989)
530	BUAV	British Union for the Abolition of Vivisection
531	BUG-E	Battlefield Universal Gateway Equipment ('buggy')
532	BUNO	Bureau Number (aircraft serial number)
533	BUR	Burma (ISO 3166 trigram; obsolete since 1989)
534	BV	Background Vocals -,Battlefield Visualization ,,Bouvet Island (ISO 3166 digram)
535	BVD	Bradley,Voorhees & Day (underwear manufacturer)
536	BVR	Beyond Visual Range
537	BVT	Bouvet Island (ISO 3166 trigram)
538	B&W	Babcock & Wilcox, Black and White, Bowers & Wilkins
539	BW	Bring Wedges (ISO digram)
540	BW	Botswana (ISO 3166 digram)
541	BWA	Botswana (ISO 3166 trigram)
542	BWARS	Bees,Wasps & Ants Recording Society
543	BWC	Biological and Toxin Weapons Convention
544	BWR	Boiling-Water Reactor
545	BX	Base eXchange
546	BY	Belarus (ISO 3166 digram), Bavaria
547	BYOB	Bring Your Own Bottle (or beer, beverage, or booze) (multiple,but similar,meanings)
548	BYOC	Bring Your Own Computer (play on BYOB)
549	BYOF	Bring Your Own Flask
550	BYS	Byelorussian Soviet Socialist Republic (ISO 3166 trigram; obsolete since 1992)
551	BYU	Brigham Young University
552	BZ	Belize (ISO 3166 digram)
553	BZP	Benzylpiperazine
554	C	Carbon, Coulomb, One Hundred (in Roman numerals)
555	c	Centi
556	C2C	Consumer-To-Consumer electronic commerce, Cam-To-Cam internet chat
557	c2c	the British rail company formerly known as LTS Rail
558	Ca	Calcium
559	CA	California (postal symbol),Canada (ISO 3166 digram),Catalonia,Civil Affairs,Close Armour,Cocaine Anonymous,Computer Associates,Counter-Air,Cricket Australia
560	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
561	CAAT	Campaign Against Arms Trade,Center for Alternatives to Animal Testing
562	CAC	California Association of Criminalists,Chronic Asymptomatic [Disease] Carrier
563	CACM	Central American Common Market
564	CACM	Communications of the ACM
565	CADCAM	Computer-Aided Design/Computer-Aided Manufacturing
566	CADMID	Concept,Assessment,Demonstration,Manufacture,In service,Disposal (life cycle mnemonic)
567	CADPAT	CAnadian Disruptive PATtern
568	CAE	Canadian Aviation Electronics (originally),Certificate in Advanced English
569	CAEn	Close Action Engagement (constructive simulation)
570	CAF	Central African Republic (ISO 3166 trigram),Confederation of African Football (or French Confédération Africaine de Football)
571	CAFAD	Combined Arms For Air Defence
572	CAFDE	Canadian Association of Film Distributors and Exporters,Computer Aided Federation Development Environment
573	CAFE	Corporate Average Fuel Economy standard
574	CAI	Computer Assisted Instruction
575	CAIR	Council on American-Islamic Relations
576	CALABARZON	A region in the Philippines: CAvite,LAguna,BAtangas,Rizal,queZON
577	CALL	Center for Army Lessons Learned
578	CALM	Communications,Air-interface,Long and Medium range
579	CalPERS	California Public Employees' Retirement System
580	Caltrans	California Department of Transpotation
581	CAM	Chemical Agent Monitor,Complementary and alternative medicine,Computer-Aided Manufacturing,Crassulacean acid metabolism (type of photosynthesis)
582	CAMRA	CAMpaign for Real Ale
583	CAN	Canada (ISO 3166 trigram)
584	CANDU	CANada Deuterium Uranium (nuclear reactor design)
585	Canola	Canadian oil,low acid (referring to a specific cultivar of rapeseed bred to have a low erucic acid content)
586	CAPES	CAPability Evaluation System,Combined Arms Planning and Execution System
587	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)
588	CARMONETTE	Computerized Monte Carlo Simulation
589	CARP	Computed Air Release Point
590	CART	Championship Auto Racing Teams (now defunct)
591	CAS	Chemical Abstracts Service,Chief of the Air Staff,Close Air Support
592	CASA	Civil Aviation Safety Authority
593	CASE	Cellular ammunition storage equipment,Computer-Aided Software Engineering
594	CASS	Command Activated Sonobuoy System
595	CASTFOREM	Combined Arms and Support Task FORce Evaluation Model
596	CASTOR	Canadian Automatic Small Telescopes for Orbital Research
597	CAT	Community Acceptance Testing
598	CATK	Counterattack
599	CATS	Computer Active Technology Suspension
600	CATT	Combined Arms Tactical Trainer
601	CAV	Cavalry
602	CAVOK	Ceiling And Visibility OK ('Kav-okay')
603	CAW	Canadian Auto Workers (trade union)
604	CB	Citizens' Band radio
605	CBASSE	Commission on Behavioral And Social Sciences and Education ('sea bass')
606	CBC	Canadian Broadcasting Corporation,Christmas Bird Count,Cipher-Block Chaining,Cornering Brake Control
607	CBE	Commander of the Order of the British Empire,Cab Beside Engine (see truck)
608	CBF	Confederação Brasileira de Futebol (Portuguese,'Brazilian Football Confederation')
609	CBGB	Country,Blue Grass,and Blues (former New York City nightclub)
610	CBLA	Comparative bullet lead analysis
611	CBM	Canadian Baptist Ministries
612	CBM	Commodore Business Machines
613	CBML	Coalition Battle Management Language
614	CBN	CardsApp Brand Number
615	CBOL	Consortium for the Barcode of Life
616	CBOT	Chicago Board of Trade
617	CBP	Customs and Border Protection
618	CBR	Case-Based Reasoning
619	CBRN	Chemical,Biological,Radiological,or Nuclear (weapon or event)
620	CBRNE	Chemical,Biological,Radiological,Nuclear or [high-yield] Explosive (weapon or event)
621	CBS	Columbia Broadcasting System,Corps Battle Simulation
622	CBUS	Columbus,Ohio
623	CC	carbon copy
624	CCA	Counter Command Activity
625	CCC	Canterbury Clothing Company,Civilian Conservation Corps (U.S.,1930s and 1940s),Corpus Christi College,Oxford
626	CCCP	Central Committee of the Communist Party,Cyrillic for SSSR (Soyuz Sovetskikh Sotsialisticheskikh Respublik,Russian Союз Советских Социалистических Республик,Union of Soviet Socialist Republics)
627	CCD	Confraternity of Christian Doctrine (Catechism)
628	CCF	Cartoon Cartoon Fridays
629	CCG	Canadian Coast Guard,Collectible Card Game
630	CCGC	Canadian Coast Guard Cutter,Canadian Coast Guard College
631	CCGH	Canadian Coast Guard Hovercraft
632	CCGS	Canadian Coast Guard Ship,Christ Church Grammar School
633	CCH	Computer-Controlled Hostile
634	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)
635	CCII	Command and Control Information Infrastructure,Community Capital Investment Initiative
636	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
637	CCIT	Comité consultatif international télégraphique (French for International Telegraph Consultative Committee,merged with the CCIF in 1956 to form the CCITT)
638	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)
639	CCK	Cholecystokinin,Cocos (Keeling) Islands (ISO 3166 trigram)
640	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
641	CCOC	Canadian Children's Opera Chorus,Crosley Car Owners Club
642	CCOP	Coalition Common Operating/Operational Picture
643	CCP	Casualty Collection Point,Communications Checkpoint,Contingency Communications Package
644	CCPA	Consumer Credit Protection Act
645	CCR	Creedence Clearwater Revival
646	CCRAp	Canadian Conservative Reform Alliance party
647	CCRP	Command and Control Research Program
648	CCRTS	Command and Control Research and Technology Symposium
649	CCSCS	Consultative Committee for Space Data Systems
650	CCSCS	Coordinadora de Centrales Sindicales del Cono Sur
651	CCSIL	Command and Control Simulation Interface Language ('cecil')
652	CCSK	Cyclic Code Shift Keying
653	CCT	Current Commitments Team
654	Cd	Cadmium
655	cd	Candela
656	CD	Compact Disc
657	CD1	Cluster of Differentiation 1 (a small gene family)
658	CDA	UK Centre for Defence Analysis
659	CDD	Capabilities Development Document
660	CDE	Chemical Defence Equipment
661	CDIAC	Carbon Dioxide Information Analysis Center ('see-dee-ack')
662	CDipAF	Certified Diploma in Accounting and Finance
663	CDL	Commercial driver's license
664	CDM	Clean Development Mechanism (Kyoto protocol), Cold Dark Matter (astronomy)
665	CDMA	Code Division Multiple Access
666	CDMSII	Cryogenic Dark Matter Search II
667	Cdr	Commander
668	CDT	Central Daylight Time (UTC−5 hours)
669	Cdt	Commandant
670	Ce	Cerium
671	CE	Christian/Common Era
672	CEA	Campaign Effectiveness Analysis
673	CECOM	U.S. Army Communications and Electronics Command
674	CEDEX	Courrier d'entreprise à distribution exceptionnelle (French,'Company Mail with Exceptional Distribution'; 'exceptional' refers to the volume of mail)
675	CEGEP	Collège d'enseignement général et professionnel (French,'College of General and Vocational Education')
676	CEI	Competitive Enterprise Institute
677	CENTCOM	United States Central Command
678	CENTO	Central Treaty Organization (Baghdad Pact)
679	CENZUB	Centre d'entraînement aux actions en zone urbaine (French,'Urban Operations Training Centre')
680	CEO	Chief Executive Officer
681	CEP	Circular Error Probable
682	CEPT	Conférence européenne des administrations des postes et des télécommunications (French,'European Conference of Postal and Telecommunications Administrations')
683	CERCLA	U.S. Comprehensive Environmental Response,Compensation,and Liability Act (Superfund)
684	CERDEC	U.S. Communications-Electronics Research,Development and Engineering Center
685	CERGA	Centre de recherches en géodynamique et astrométrie (French,'Astrometry and Geodynamics Research Centre')
686	CERN	Centre européen pour la recherche nucléaire (French,'European Organization for Nuclear Research')
687	CERT	Computer Emergency Response Team
688	CESS	Centre for Earth Science Studies (India)
689	CEST	Central European Summer Time
690	CET	Central European Time
691	CEWC	Council for Education in World Citizenship
692	Cf	Californium
693	CF	Canadian Forces,Central African Republic (ISO 3166 digram)
694	CFA	Cat Fanciers' Association,Chartered Financial Analyst,Colour Filtering Array,County Fire Authority,Covering Force Area
695	CFAR	Christine's,Federal Acquisition Regulation
696	CFC	ChloroFluoroCarbon,Canadian Fish Company
697	CFES	Continuous Flow Electrophoresis System
698	CFFZ	Call For Fire Zone
699	CFG	Context-free grammar,Control flow graph
700	CFHT	Canada-France-Hawaii Telescope
701	CFI	Center for Inquiry (CSICOP)
702	CFL	Canadian Football League,Co-ordinated Fire Line
703	CFLCC	Coalition Forces Land Component Command
704	CFM	Certified Facilities Manager
705	CFO	Chief Financial Officer
706	CFP	Call for papers, College Football Playoff, Common Fisheries Policy (EU)
707	CFR	Code of Federal Regulations,Căile Ferate Române (Romanian,'Romanian Railways')
708	CFRP	Carbon fibre reinforced plastic
709	CFS	Chronic Fatigue Syndrome
710	CFSP	Common Foreign and Security Policy
711	CFU	Colony Forming Unit in Microbiology
712	CFV	Cavalry Fighting Vehicle
713	CFZ	Critical Friendly Zone
714	CG	Client Group,Computer Graphics,Controls Group,Republic of the Congo (ISO 3166 digram)
715	CGH	Comparative Genomic Hybridisation
716	CGIG	Cross-Government Implementation Group
717	CGO	Republic of the Congo (IOC and FIFA trigram,but not ISO 3166)
718	CGS	Chief of the General Staff
719	CGT	Capital Gains Tax
720	ch	ch(L) is used to denote the Chern character of a line bundle
721	CH	Chieftain tank,Switzerland (ISO 3166 digram; from Latin Confoederatio Helvetica)
722	CHAMPUS	(U.S.) Civilian Health and Medical Program of the Uniformed Services (now known as TRICARE)
723	CHAOS	Cambridge Heart Anti-Oxidant Study
724	CHAPS	Clearing House Automated Payment System
725	CHDK	Canon Hack Development Kit (Canon camera firmware hack)
726	CHE	Switzerland (ISO 3166 trigram; from Latin Confoederatio Helvetica)
727	CHI	Columbia Helicopters,Inc
728	CHiP	California Highway Patrol
729	CHIPS	Cosmic Hot Interstellar Plasma Spectrometer
730	CHL	Chile (ISO 3166 trigram)
731	CHLA	Core Historical Literature of Agriculture
732	CHN	China (ISO 3166 trigram)
733	CHOGM	Commonwealth Heads of Government Meeting
734	CHPSO	California Hospital Patient Safety Organization
735	CHRS	Canadian Heart Rhythm Society
736	CHT	Certified Hand Therapist
737	CI	Côte d'Ivoire (ISO 3166 digram),Counter-Intelligence,101 (in Roman numerals)
738	Ci	Curie
739	CIA	U.S. Central Intelligence Agency, Cairo International Airport, Culinary Institute of America
740	CIAO	Critical Infrastructure Assurance Office,Component-Integrated ACE ORB
741	CIB	Complete In Box (Internet auction/trading listings)
742	CIBC	Canadian Imperial Bank of Commerce
743	CICS	Customer Information Control System (IBM mainframe software; 'kicks' or 'C-I-C-S')
744	CID	Certified Interior Designer
745	CIEF	Comité international d'enregistrement des fréquences (International Frequency Registration Board)
746	CIF	Cost,Insurance,and Freight (Paid) (shipping)
747	CIMMYT	Centro Internacional de Mejoramiento de Maíz Y Trigo (Spanish,'International Maize and Wheat Improvement Center')
748	CINC	Commander in Chief
749	CINEOS	Campo Imperatore Near-Earth Object Survey
750	CIO	Chief information officer,Congress of Industrial Organizations
751	CIPE	(European) Centre for International Political Economy
752	CIR	(Commander's) Critical Information Requirements
753	CIR	Corotating Interaction Region
754	CIS	Canadian Interuniversity Sport,Commonwealth of Independent States,Command and Information System,Communication and Information System
755	CISA	(U.S.) C4I Integration Support Activity
756	CISB	Complete In Sealed Box (Internet auction/trading listings)
757	CISPR	Comité international spécial des perturbations radioélectriques (Special International Committee on Radio Interference)
758	CISSP	Certified Information Systems Security Professional
759	CITES	Convention on International Trade in Endangered Species (of Wild Fauna and Flora) ('sigh-tease')
760	CIV	Côte d'Ivoire (ISO 3166 trigram)
761	CIVETS	Colombia,Indonesia,Vietnam,Egypt,Turkey,South Africa (economics)
762	CIVPOP	Civilian Population
763	CIWS	Close-In Weapon System
764	CJ	Criminal Justice
765	CJC	Canadian Jewish Congress,Cold Junction Compensation
766	CJCS	Chairman of the Joint Chiefs of Staff
767	CJD	Chronological Julian Day,Creutzfeldt-Jakob Disease
768	CJO	Chief of Joint Operations
769	CJTF	Combined Joint Task Force
770	CK	Cook Islands (ISO 3166 digram)
771	CKA	commonly known as, Canada Kicks Ass
772	CKND	Codename: Kids Next Door
773	CL	Chile (ISO 3166 digram),Co-ordination Line,One Hundred and Fifty (in Roman numerals)
774	Cl	Chlorine
775	CLA	Clutterers Anonymous
776	CLEC	Competitive Local Exchange Carrier
777	CLEMARS	California Law Enforcement Mutual Aid Radio System
778	CLIC	Compact LInear Collider
779	CLO	Cornell Lab of Ornithology
780	CLOS	Command to Line-Of-Sight (missile control system)
781	CLPFC	CentroLateral PreFrontal Cortex
782	CLRP	College Loan Repayment Program
783	CM	Cameroon (ISO 3166 digram),Cruise Missile,Nine Hundred (in Roman numerals)
784	Cm	Curium
785	CMA	U.S. Chemical Materials Agency,Country Music Association (also used to refer to the organization's annual awards),Crystal Meth Anonymous
786	CMHC	Canada Mortgage and Housing Corporation
787	CMIIAW	Correct me if I am wrong
788	CMIS	Common management information service
789	CMJ	Christopher Martin-Jenkins (BBC sports commentator)
790	CMLL	Consejo Mundial de Lucha Libre (Spanish,'Worldwide Wrestling Council'—Mexican professional wrestling promotion)
791	CMMC	Corps Materiel Management Centre
792	CMML	Chronic MyeloMonocytic Leukemia,Continuous Media Markup Language
793	CMOS	Canadian Meteorological and Oceanographic Society,(The) Chicago Manual of Style,Complementary Metal Oxide Semiconductor
794	CMP	Common [Operating/Operational] Maritime Picture
795	CMPD	Charlotte Mecklenburg Police Department
796	CMPD	Chronic Myeloproliferative Disease
797	CMR	Cameroon (ISO 3166 trigram),Coaxial Main Rotors (helicopter type)
798	CMS	Centers for Medicare and Medicaid Services,The Chicago Manual of Style
799	CMT	Country Music Television
800	CMU	Carnegie Mellon University,Central Michigan University,Concrete Masonry Unit
801	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)
802	CMYK	Cyan Magenta Yellow Key/blacK (colour model)
803	CN	Canadian National (railway; also the AAR reporting mark for said company),China (ISO 3166 digram)
804	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
805	CNBC	Consumer News and Business Channel
806	CND	Campaign for Nuclear Disarmament,Computer Network Defence
807	CNE	Canadian National Exhibition,Computer Network Exploitation,Certified Network Engineer
808	CNF	Cost and Freight
809	CNI	Clinical Nursing Intern
810	CNI	Communications,Navigation and Identification
811	CNN	Cable News Network,Cellular Nonlinear Network
812	CNV	Copy-Number Variable (genetics)
813	Co	Cobalt
814	COB	Close Of Business [day]
815	COBRA	Consolidated Omnibus Budget Reconciliation Act of 1985
816	COD	Cash On Delivery,Democratic Republic of the Congo (ISO 3166 trigram)
817	CoDA	Co-Dependents Anonymous
818	COGENT	Cognitive Objects within a Graphical EnviroNmenT
819	COIL	Chemical Oxygen Iodine Laser
820	COK	Cook Islands (ISO 3166 trigram)
821	COL	Colombia (ISO 3166 trigram)
822	COLA	Cost Of Living Adjustment
823	CONAD	U.S. Continental Air Defense Command
824	CONMEBOL	Confederación Sudamericana de Fútbol or Confederação Sul-Americana de Futebol (respectively Spanish and Portuguese for 'South American Football Confederation')
825	CONUS	Continental United States
826	COO	Chief Operating Officer
827	COPE	U.K. Committee On Publication Ethics
828	COPUS	U.K. Committee on the Public Understanding of Science
829	CORD	Common Operational Requirements Document
830	CORE	Consortium for Oceanographic Research and Education
831	COS	Cooper Ornithological Society
832	COSER	COoperative SERvice
833	CoT	Car of Tomorrow (former NASCAR race car design)
834	COTS	Commercial Off The Shelf
835	CP	Canadian Pacific,Check Point,Command Post,Club Penguin
836	CPA	Certified Public Accountant
837	CPAC	Conservative Political Action Conference,Cable Public Affairs Channel ('see-pack')
838	CPCU	Certified Property Casualty Underwriter
839	CPD	Capabilities Production Document
840	CPE	Certificate of Proficiency in English
841	CPE	Certified Professional Ergonomist
842	CPF	Calibration Parameter File,Canadian Patrol Frigate
843	CPG	Clinical Practice Guideline
844	CPIM	Certification on Production and Inventory Management
845	CPIR	Computationally-Private Information Retrieval
846	CPON	Certified Pediatric Oncology Nurse
847	CPPCC	Chinese People's Political Consultative Conference
848	CPR	Canadian Pacific Railway
849	CPR	Cardiopulmonary resuscitation
850	CPSM	Continuous Phase Shift Modulation
851	CPSU	Communist Party of the Soviet Union
852	CPT	Contingency Planning Team
853	CPU	Contract Postal Unit
854	CPV	Cape Verde (ISO 3166 trigram)
855	CPX	Command Post eXercise
856	CQ	Carrier Qualification,Central Queensland,Charge of Quarters,Congressional Quarterly,Constellation Airlines (IATA airline designator)
857	CQD	Close Quarters Drill (Morse distress code preceding SOS: CQ 'calling all stations',D 'Distress'; often incorrectly interpreted as 'Come Quick,Distress')
858	Cr	Chromium
859	CR	Costa Rica (ISO 3166 digram)
860	CRAM	Combined Radiometric Correction Model
861	CRD	Capstone Requirements Document
862	CREB	Cyclic AMP-response Element Binding (protein)
863	CREEP	Committee for the Re-Election of the President,a pejorative nickname used by opponents
864	CREN	Christian Real Estate Network Real Estate Association
865	CRI	China Radio International,Costa Rica (ISO 3166 trigram)
866	CRIPL	Consolidated Remain-In-Place List
867	CRM	Cardiac Rhythm Management,Customer Relationship Management
868	CRO	Croatia (IOC and FIFA trigram,but not ISO 3166)
869	CRP	Committee for the Re-Election of the President,Control and Reporting Post
870	CRT	Cardiac Resynchronization Therapy,Cathode Ray Tube,Chinese Remainder Theorem
871	CRTC	Canadian Radio-television and Telecommunications Commission
872	Cs	Caesium
873	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
874	CSC	Closed Spacelike Curve (relativity),Compact system camera,Computer Sciences Corporation,Computer Security Centre,CSCC Canadian Society of Clinical Chemists
875	CSERIAC	(U.S. DoD) Crew Systems Ergonomics Information Analysis Center
876	CSG	Corps Support Group
877	CSI	see entry
878	CSICOP	Committee for the Scientific Investigation of Claims of the Paranormal (became the Committee for Skeptical Inquiry in 2006)
879	CSIP	Commercial Stable Image Platform (AMD)
880	CSIS	Canadian Security Intelligence Service ('seessiss'),(U.S.) Center for Strategic & International Studies
881	CSK	Czechoslovakia (ISO 3166 trigram; obsolete since 1993)
882	CSL	U.K. Central Science Laboratory
883	CSPI	Center for Science in the Public Interest
884	CSR	Control Supply Rate
885	CSR	Corporate Social Responsibility
886	CSRC	Conflict Studies Research Centre
887	CSRF	Cross-Site Request Forgery
888	CST	Central Standard Time (UTC−6 hours)
889	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)
890	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')
891	CTBT	Comprehensive [Nuclear] Test Ban Treaty
892	CTDB	Compact Terrain Data Base (file format)
893	CTE	Canton and Enderbury Islands (ISO 3166 trigram; obsolete 1984),Chronic traumatic encephalopathy
894	CTGF	connective tissue growth factor
895	CTI	Co-operative Target Identification
896	CTIL	Critical Tracked Items List
897	CTIS	Central Tire Inflation System
898	CTMS	Clinical Trial Management System
899	CTO	Chief Technical Officer,Chief Technology Officer
900	CTS	Clear-To-Send,Collective Training Standards,Communications Technology Service,Contract Technical Services,Conversation Time Sharing,COSMIC Top Secret
901	CTSS	Compatible Time-Sharing System
902	CTU	Counter Terrorist Unit (fictional branch of the Central Intelligence Agency in the television action series 24)
903	CTVT	Canine Transmissible Venereal Tumour
904	CU	Carrie Underwood, Cuba (ISO 3166 digram)
905	Cu	Copper (Latin 'Cuprum')
906	CUB	Cuba (ISO 3166 trigram)
907	CUCV	Commercial Utility Cargo Vehicle
908	CUNY	City University of New York ('CUE-knee')
909	CUPE	Canadian Union of Public Employees ('CUE-pee')
910	CUPS	Common Unix Printing System
911	CUPW	Canadian Union of Postal Workers
912	CUREA	Consortium for Undergraduate Research and Education in Astronomy
913	CuW	Copper-tungsten pseudo-alloy (from the chemical symbols of the two component elements)
914	CUW	Curaçao (ISO 3166 trigram)
915	CV	curriculum vitae (résumé)
916	CVLL	Crypto Variable Logic Label
917	CVSD	Continuous Variable Slope Delta (modulation)
918	CVT	Continuously Variable Transmission
919	CW	Calendar Week, or: Continuous Wave, or: Clothes Washer
920	CWA	Communications Workers of America
921	CWC	Chemical Weapons Convention
922	CWRU	Case Western Reserve University
923	CWS	Canadian Wildlife Service
924	CX	Christmas Island (ISO 3166 digram),or: One Hundred and Ten (in Roman numerals)
925	CXR	Christmas Island (ISO 3166 trigram)
926	CY	Calendar year, or: Cyprus (ISO 3166 country code digram)
927	CYM	Cayman Islands (ISO 3166 trigram)
928	CZE	Czech Republic (ISO 3166 trigram)
929	CZF	(Christian Zombie Fan)
930	CZMA	(US) Coastal Zone Management Act
931	d	Deci
932	D	Deuterium
933	DA	Debtors Anonymous,U.S. Department of the Army,District Attorney
934	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')
935	DAES	Defence Acquisition Executive Summary,(UK MoD) Directorate of Analysis,Experimentation and Simulation
936	DAF	Dissolved Air Flotation,a technique used in water treatment
937	DAFIF	Digital Aeronautical Flight Information File
938	DAK	Disney's Animal Kingdom
939	DAO	Division Ammunition Officer
940	DAQ	Data acquisition,Delivered Audio Quality
941	DARE	Drug Abuse Resistance Education
942	DARO	(U.S.) Defense Airborne Reconnaissance Office
943	DARPA	U.S. Defense Advanced Research Projects Agency
944	DART	Disaster Assistance Response Team,Dublin Area Rapid Transit
945	DAS	Defensive Aids Suite
946	DASD	(U.S.) Deputy Assistant Secretary of Defense
947	DASL	Datapoint's Advanced Systems Language
948	DAU	(U.S.) Defense Acquisition University
949	DAWN	(U.S.) Drug Abuse Warning Network
950	dB	Decibel
951	DB	Deutsche Bahn
952	Db	Dubnium
953	DBA	De Bellis Antiquitatis (miniature wargaming rules)
954	DBBL	(U.S. Army Simulation Center) Dismounted Battlespace Battle Laboratory
955	DBDO	Desert BDO
956	DBE	Dame Commander of the Order of the British Empire
957	DBF	Detection By Fire (weapon launch signature)
958	DBR	De Bellis Renationis (miniature wargaming rules)
959	DBRA	Davis-Bacon Related Acts
960	DBS	Direct Broadcast Services (television)
961	DC	da capo,Italian Democrazia Cristiana,Digital Compass,Direct Current,District of Columbia (postal symbol),Douglas Aircraft Company,Dublin Core,Duty Cycle
962	DCA	Defensive Counter Air,Drum Corps Associates,DiChloroAcetate
963	DCAA	(U.S.) Defense Contract Audit Agency
964	DCAS	Devon and Cornwall Archery Society
965	DCC	Dallas Christian College
966	DCD	[Organ] Donation after Cardiac Death
967	DCE	Data Communication Equipment
968	DCFC	Death Cab for Cutie
969	DCI	Detection,Classification and Identification,Drum Corps International,Duellists' Convocation International,now known simply by the initials
970	DCL	Disney Cruise Line
971	DCN	Deacon
972	DCOM	Disney Channel Original Movie
973	DCSOPS	Deputy Chief of Staff for Operations and plans
974	DCW	Digital Chart of the World
975	DCYSC	Discovery Channel Young Scientist Challenge
976	DD	due diligence and dear daughter (increasingly prevalent on social mailing lists,blogs,and bulletin boards)
977	DDA	Deputy District Attorney
978	DDN	U.S. Defense Data Network
979	DDS	Doctor of Dental Surgery
980	DDT	Dichloro-Diphenyl-Trichloroethane (insecticide),Dynamic Debugging Tool (computing),DE[edit]
981	DE	Delaware (postal symbol),Germany (ISO 3166 digram)
982	DEA	Drug Enforcement Administration
983	DEA	Drug Enforcement Agency
984	DEC	Department of Environmental Conservation,Digital Equipment Corporation,Disasters Emergency Committee
985	DeCA	(U.S.) Defense Commissary Agency
986	DEFCON	Defence readiness condition
987	DEFRA	(UK) Department for Environment,Food and Rural Affairs
988	DELT	Dual Ended Line Test (ing)
989	DEM	Data Exchange Mechanism,Digital Elevation Model
990	DEN	Denmark (IOC and FIFA trigram,but not ISO 3166)
991	DEPSECDEF	(U.S.) Deputy Secretary of Defense
992	DERA	British Defence Evaluation and Research Agency (1995-2001)
993	DES	Deep Ecliptic Survey
994	DEU	Germany (ISO 3166 trigram)
995	DF	Direct Fire,Direction Finding,Distrito Federal (Spanish and Portuguese for 'federal district')
996	DFAS	(U.S.) Defense Finance and Accounting Service
997	DFB	Deutscher Fußball-Bund (German for 'German Football Association')
998	DFCB	Data Format Control Book
999	DfID	UK Department for International Development
1000	DFM	Discrete Field Model see Superluminal motion
1001	DFM	Dynamic Flowgraph Methodology
1002	DFSP	Dermatofibrosarcoma protuberans
1003	DfT	UK Department for Transport
1004	DFTBA	Don't Forget To Be Awesome,a term commonly used by the Vlogbrothers
1005	DG	Dei gratia (Latin,'by the grace of God'),Director-General,Data General
1006	DGA	Direction générale des armées (French 'Armed Forces General Directorate')
1007	DGPS	Differential GPS
1008	DGZ	Desired Ground Zero
1009	DHA	DocosaHexaenoic Acid
1010	DHHS	(U.S.) Department of Health and Human Services
1011	DHRA	(U.S.) DoD Human Resources Activity
1012	DHS	U.S. Department of Homeland Security
1013	DHSS	UK Department of Health and Social Security
1014	DHTFYSS	U.S. Don't Have Time For You Silly S****
1015	DHY	Dahomey (ISO 3166 trigram; became BEN for Benin in 1977)
1016	DIA	U.S. Defense Intelligence Agency
1017	DIAC	Department of Immigration and Citizenship (Australia) [1]
1018	DiC	Design Island Centre (computing usually used in a teaching situation)
1019	DICASS	DIrectional Command Activated Sonobuoy System
1020	DIFAR	DIrectional Frequency Analysis and Recording
1021	DIME	Dense Inert Metal Explosive
1022	DIP	Dual In-line Package (electronics)
1023	DIPS	Defense independent pitching statistics
1024	DIR	Defence Industrial Research
1025	DISCOM	Division Support Command
1026	DISE	Deployable Intelligence Support Element
1027	DISSTAF	DIS Search and Target Acquisition Fidelity experiment
1028	DITY	Do-It-Yourself
1029	DIVAD	Division Air Defence
1030	DIY	Do It Yourself
1031	DJI	Djibouti (ISO 3166 trigram)
1032	DK	Denmark (ISO 3166 digram)
1033	DL	Dexter's Laboratory
1034	DLIC	Detachment Left-In-Contact
1035	DLIR	Depot-Level Inspection and Repair
1036	DLPMC	DorsoLateral PreMotor Cortex
1037	DLRP	Data Link Reference Point
1038	DLS	Deep Lens Survey
1039	DLSA	(U.S.) Defense Legal Services Agency
1040	DLSc	Diploma in Library Science
1041	DLTBGYD	Don't let the bastards grind you down
1042	DMC	(U.S.) Defense Management Council
1043	DMCA	Digital Millennium Copyright Act
1044	DMM	Digital Multimeter
1045	DMOC	Distributed Mission Operations Centre
1046	DMPA	(U.S.) Defense Medical Programs Activity
1047	DMPFC	DorsoMedial PreFrontal Cortex
1048	DMPK	Drug Metabolism and Pharmacokinetics
1049	DMRB	Design Manual for Roads and Bridges
1050	DMS	U.S. Defense Message System
1051	DMSP	U.S. Defense Meteorological Satellite Program
1052	DMT	Dimethyltryptamine
1053	DMV	Department of Motor Vehicles
1054	DMZ	DeMilitarized Zone
1055	DN	Deacon
1056	DNAW	Day Night All Weather
1057	DNDi	Drugs for Neglected Diseases initiative
1058	DNDO	U.S. Domestic Nuclear Detection Office
1059	DNK	Denmark (ISO 3166 trigram)
1060	DNM	Defence Nuclear Material
1061	DNR	Do Not Resuscitate
1062	DNS	Domain Name System
1063	DO	Dominican Republic (ISO 3166 digram),Doctor of Osteopathic Medicine
1064	DOA	Dead On Arrival,Dead or Alive
1065	DOB	Date Of Birth
1066	DOD	U.S. Department of Defense
1067	DODAF	U.S. Department of Defense Architectural Framework
1068	DoDD	U.S. Department of Defense Directive
1069	DoDEA	(U.S.) Department of Defense Education Activity
1070	DOE	U.S. Department of Energy
1071	DOHC	Dual-OverHead-Cam engine
1072	DOI	U.S. Department of the Interior
1073	DORA	Defence of the Realm Act
1074	DOS	Density of State
1075	DOTA	short-form for DEFENSE OF THE ANCIENTS a popular online epic game
1076	DotD	Deal of the Day (marketing gimmick)
1077	DOW	Died of Wounds
1078	DP	Division de production (Algerian petroleum company)
1079	DPA	UK Defence Procurement Agency
1080	DPCO	Double-Pole Change Over
1081	DPDT	Double-Pole Double-Throw
1082	DPI	Dots Per Inch
1083	DPICM	Dual-Purpose Improved Conventional Munition
1084	DPKO	UN Department for Peacekeeping Operations
1085	DPMO	(U.S.) Defense Prisoner of War/Missing Personnel Office
1086	DPPDB	Digital Point Positioning Database
1087	DPRK	Democratic People's Republic of Korea
1088	DPST	Double-Pole Single-Throw
1089	DQ	Dairy Queen
1090	DR	Dead Reckoning,Danmarks Radio (Danish Broadcasting Corporation)
1091	DRC	Democratic Republic of the Congo
1092	DRDC	Defence Research & Development Canada
1093	DREA	Defence Research Establishment Atlantic (obsolete 2002)
1094	DRES	Defence Research Establishment Suffield (obsolete 2002)
1095	DRET	Defence Research Establishment Toronto (obsolete 2002)
1096	DREV	Defence Research Establishment Valcartier (obsolete 2002)
1097	DRIC	(U.S.) Defense Research Information Center
1098	DRMS	(U.S.) Defense Revitalization and Marketing Service
1099	DRPR	Drawing Practices
1100	DRT	Document Related Technologies
1101	Ds	Darmstadtium
1102	DSAS	Disney Sing Along Songs
1103	DSB	(U.S.) Defense Science Board
1104	DSCS	U.S. Defense Satellite Communications System
1105	DSCSOC	DSCS Operations Center
1106	DSE	Dry Sheep Equivalent
1107	DSG	Direct-Shift Gearbox
1108	DSID	Dismounted Soldier Identification System
1109	DSL	Digital Subscriber Line
1110	DSLR	Digital single-lens reflex (camera)
1111	DSM	Diagnostic and Statistical Manual of Mental Disorders
1112	DSN	Deep Space Network
1113	DSPL	Design Specialists and Plans Language
1114	DSR	Deformed Special Relativity
1115	DST	Daylight Saving Time
1116	DSTL	British Defence Science and Technology Laboratory
1117	DSWA	(U.S.) Defense Special Weapons Agency
1118	DTA	Dental Technologists Association
1119	DTD	Digital Terrain Data
1120	DTG	Date-Time Group
1121	DTH	Direct To Home (television)
1122	DTI	UK Department of Trade and Industry
1123	DTIC	(U.S.) Defense Technical Information Center
1124	DTL	Diode-Transistor Logic (electronics)
1125	DTMF	Dual-tone multi-frequency signaling
1126	DTO	Disruptive Technology Office (was ARDA)
1127	DTR	Determine The Relationship
1128	DTSA	(U.S.) Defense Technology Security Administration
1129	DUMBO	Down Under the Manhattan Bridge Overpass (Brooklyn neighborhood)
1130	DUSD	(U.S.) Deputy Under-Secretary of Defense
1131	DVLC	UK Driver and Vehicle Licencing Centre
1132	DVM	Doctor of Veterinary Medicine
1133	DVO	Direct View Optics
1134	DVOM	Digital Volt-Ohm Meter
1135	DVP	various meanings (disambiguation page)
1136	DW	Drum Workshop
1137	DWIM	Do What I Mean
1138	DWM	Doctor Who Magazine
1139	DWTS	Dancing with the Stars
1140	DWW	Down with Webster
1141	DXA	Dual-energy X-ray Absorptiometry
1142	DXM	DeXtroMethorphan
1143	DY	Dahomey (ISO 3166 digram; obsolete since 1977)
1144	Dy	Dysprosium
1145	DZA	Algeria (ISO 3166 trigram)
1146	E	East
1147	EABU	Explain Acronyms Before Use
1148	EAC	Echelons Above Corps
1149	EAPC	Euro-Atlantic Partnership Council
1150	EAST	Experimental Advanced Superconducting Tokamak
1151	EBD	Electronic Brake Distribution
1152	EBE	Extraterrestrial Biological Entity
1153	EBSA	Employee Benefits Security Administration
1154	EBW	Electron Beam Welding
1155	EBW	Exploding BridgeWire
1156	ECASS	European Centre for Analysis in the Social Sciences [1]
1157	ECBR	European Coalition for Biomedical Research
1158	ECCM	Electronic Counter-Counter-Measures
1159	ECFS	Electronic Case Filing System
1160	ECG	Electrocardiogram
1161	ECHR	European Convention on Human Rights
1162	ECJ	European Court of Justice
1163	ECL	Emitter Coupled Logic (electronics)
1164	ECommHR	European Commission on Human Rights
1165	ECSC	European Coal and Steel Community (distant ancestor of the EU)
1166	ECT	ElectroConvulsive Therapy
1167	ECtHR	European Court of Human Rights
1168	EDA	European Defence Agency
1169	EDAC	Error Detection And Correction
1170	EDCS	Environmental Data Coding Specification
1171	EDH	Eastman Dental Hospital
1172	EDSA	Epifanio de los Santos Avenue (a major thoroughfare in Manila with great significance to post-1980 Philippines history)
1173	EDT	Eastern Daylight Saving Time (UTC−4 hours)
1174	EEC	European Economic Community (predecessor of the EU)
1175	EEG	ElectroEncephaloGram
1176	EENT	End Evening Nautical Twilight
1177	EEO	Equal Employment Opportunity
1178	EEOC	(U.S.) Equal Employment Opportunity Commission
1179	EEZ	Economic Exclusion Zone or Exclusive Economic Zone
1180	EFF	Electronic Frontier Foundation
1181	EFL	English as a Foreign Language
1182	EFM	Enterprise Feedback Management
1183	EFOA	European Fuel Oxygenates Association
1184	EFSA	European Food Safety Authority
1185	EFT	Electronic Fund Transfer
1186	EFV	Expeditionary Fighting Vehicle
1187	EG	Egypt (ISO 3166 digram)
1188	EGCG	EpiGalloCatechin-3-Gallate
1189	EGIS	Erieye Ground Interface Segment
1190	EGRET	Energetic Gamma-Ray Experiment Telescope
1191	EGY	Egypt (ISO 3166 trigram)
1192	EHF	Extremely High Frequency
1193	EHR	Equipment History Record
1194	Ei	Exbi
1195	EIA	Environmental Impact Assessment
1196	EIAH	Encyclopedia of Iranian Architectural History
1197	EIAH	Environnements Informatiques pour l'Apprentissage Humain
1198	EIC	East India Company
1199	EICS	East India Company's Service
1200	eID	electronic ID
1201	EIRP	Effective Isotropic Radiated Power
1202	EIS	Environmental Impact Statement
1203	EJ	Exajoule
1204	EK	Exakelvin
1205	EKG	Electrocardiogram (from German Elektrokardiogramm)
1206	EKMS	Electronic Key Management System
1207	EL	Exalitre
1208	ELINT	Electronic Intelligence
1209	ELL	English Language Learner
1210	ELM	Edge-Localised Mode (plasma physics)
1211	ELO	Electric Light Orchestra
1212	ELSS	Emergency Life Support Stores
1213	EM	ElectroMagnetism/ElectroMagnetic
1214	Em	Exametre
1215	EMA	European Medicines Agency
1216	EMCON	(Electromagnetic) Emissions Control
1217	EMDG	Euro-Missile Dynamics Group
1218	EMDR	Eye Movement Desensitisation and Reprocessing
1219	EMEA	Europe,Middle East and Africa
1220	EMG	ElectroMyoGraph
1221	EMP	ElectroMagnetic Pulse
1222	EMS	Emergency Medical Services
1223	EMT	Emergency Medical Technician
1224	EN	Corps of Engineers,Exanewton
1225	ENCODE	Encyclopedia of DNA Elements (human genome data project)
1226	ENE	East North-East
1227	ENG	England (FIFA trigram; not eligible for an ISO 3166 or IOC trigram)
1228	ENTEC	Euro NATO Training Engineer Centre
1229	ENVL	Envelope
1230	ENY	Enemy
1231	EOD	Explosive Ordnance Disposal
1232	EOG	ElectroOculoGraphy
1233	EOM	End of Message
1234	EOSAT	Earth Observation Satellite
1235	EOSDIS	Earth Observation Satellite Data and Information System
1236	EP	European Parliament
1237	EP	Extended play
1238	EPCOT	Experimental Prototype Community Of Tomorrow
1239	EPGS	EOS Polar Ground Sites
1240	EPIRB	Emergency Position Indicating Radio Beacon
1241	EPL	English Premier League
1242	EPOS	Electronic Point Of Sale
1243	EPPA	Employee Polygraph Protection Act
1244	EPR	European Pressurised [Nuclear] Reactor
1245	EQ	Emotional Quotient
1246	Er	Erbium
1247	ERCIM	European Research Consortium for Informatics and Mathematics
1248	ERI	Eritrea (ISO 3166 trigram)
1249	ERLAWS	Eastern Ruapehu Lahar Alarm and Warning System
1250	EROS	Earth Resources Observation System
1251	ERP	Engineer Regulating Point
1252	ERR	Eesti Rahvusringhääling
1253	ERS	Earth Resources Survey
1254	ERTS	Earth Resources Technology Satellite (became Landsat)
1255	ERV	Endogenous RetroVirus
1256	ES	Electronic warfare Support,Exasiemens,Spain (ISO 3166 digram; from the country's native name of España)
1257	ESD	ElectroStatic Discharge
1258	ESDP	European Security and Defence Policy
1259	ESE	East South-East
1260	ESH	Western Sahara (ISO 3166 trigram)
1261	ESL	English as a Second Language
1262	ESM	Electronic warfare Support Measures
1263	ESO	European Southern Observatory
1264	ESOL	English for Speakers of Other Languages
1265	ESPN	Entertainment and Sports Programming Network
1266	ESU	Emergency Services Unit
1267	ESV	Engineer Support Vehicle
1268	ET	Ethiopia (ISO 3166 digram)
1269	ETH	Ethiopia (ISO 3166 trigram)
1270	ETI	Extra-Terrestrial Intelligence
1271	ETLA	Extended TLA
1272	ETT	Embedded Training Team
1273	EU	European Union
1274	Eu	Europium
1275	EUCOM	(U.S.) European Command
1276	EUUSA	European Union and United States of America
1277	EV	Exavolt
1278	EVIL	Electronic viewfinder (with) interchangeable lens (a type of digital camera)
1279	EWTN	Eternal Word Television Network
1280	Exatesla	Extra Terrestrial
1281	EXREP	Expeditious Repair (SM&R code)
1282	EZ	Extraction Zone
1283	f	Femto
1284	fA	Femtoampere
1285	FA	Food Addicts in Recovery Anonymous
1286	FAA	Financial Aid Administrator,Fleet Air Arm,Functional Area Analysis
1287	FAAD	Forward Area Air Defence
1288	FAADEZ	Forward Area Air Defence Engagement Zone
1289	FAAFP	Fellow of the American Academy of Family Physicians
1290	FAAN	Fellow of the American Academy of Neurology
1291	FAAN	Fellow of the American Academy of Nursing
1292	FAAQ	Frequently Asked and Anticipated Questions
1293	FAASV	Field Artillery Ammunition Supply Vehicle
1294	FAB	Feline Advisory Bureau (UK feline charity)
1295	FACA	(US) Federal Advisory Committee Act
1296	FACH	Fuerza Aérea de Chile
1297	FACN	Fellow of the American College of Nutrition
1298	FACP	Fellow of the American College of Physicians
1299	FACTS	Flexible Alternating Current Transmission System
1300	FAM	Foreign Affairs Manual
1301	FAO	Food and Agriculture Organization
1302	FAPA	Fellow of the American Psychological Association
1303	FAPHA	Fellow of the American Public Health Association
1304	FARP	Forward Arming and Refuelling Point / Forward Area Rearm/refuel Point
1305	FASCAM	Family of Scatterable Mines[1]
1306	FASD	Fetal Alcohol Spectrum Disorder
1307	FASEB	Federation of American Societies for Experimental Biology
1308	FAT	Field Artillery Tractor
1309	FAVS	Future Armoured Vehicle System
1310	FAW	Football Association of Wales
1311	FBCS	Fellow of the British Computer Society
1312	FBIDST	Fellow of the British Institute of Dental and Surgical Technologists
1313	FBIS	Foreign Broadcast Information Service
1314	FBM	Board foot
1315	fC	Femtocoulomb
1316	FCC	U.S. Federal Communications Commission
1317	FCE	First Certificate in English
1318	FCF	Financial Free Cash Flow
1319	FCLA	Fraud Claims Law Associate
1320	FCO	UK Foreign and Commonwealth Office
1321	FCW	Florida Championship Wrestling
1322	FD	Falun Dafa
1323	FDA	Food and Drug Administration (U.S.)
1324	FDBK	(I) Feedback
1325	Fe	Iron (Latin Ferrum)
1326	FEAST	Forum for European-Australian Science and Technology Cooperation
1327	FEATS	Festival of European Anglophone Theatrical Societies link title
1328	FEBA	Forward Edge of the Battle Area
1329	FED	Field Emission Display
1330	FEDEP	Federation Development Process (Simulation)
1331	FEF	Frontal Eye Field (neurophysiology)
1332	FEMA	Farm Equipment Manufacturers Association, U.S. Federal Emergency Management Agency,Fire Equipment Manufacturers' Association
1333	FENS	Federation of European Neuroscience Societies
1334	FES	Flywheel Energy Storage
1335	FEST	Frankfurt English Speaking Theatre link title
1336	FET	Field-effect transistor
1337	FEZ	Fighter Engagement Zone
1338	fF	Femtofarad
1339	FF	Final Fantasy
1340	FFB	Frum From Birth (referring to an observant Jew born into a religiously observant family)
1341	FFC	Free For Chat
1342	FFE	Fukuoka Futures Exchange
1343	FFF	Fédération française de football (French for: French Football Federation)
1344	FFG	Guided Missile Frigate (hull classification symbol)
1345	FFOV	Forward Field Of View
1346	FFR	Fédération française de rugby (French for: French Rugby (Union) Federation)
1347	FFS	For Fuck's Sake
1348	FFT	Final Fantasy Tactics
1349	FG	Falun Gong
1350	fg	Femtogram
1351	FG	Fog (METAR Code)
1352	FGOTUS	First Gentleman of the United States
1353	FGR	Flickr Group Roulette
1354	fH	Femtohenry
1355	FHFIF	Foster's Home for Imaginary Friends
1356	FHI	Family Health International, Fuji Heavy Industries,Ltd.
1357	FI	Finland (ISO 3166 digram)
1358	FIAT	Fabbrica Italiana Automobili Torino (Italian for: Italian Car Factory of Turin)
1359	FIB	Fucking Illinois Bastard (Wisconsin slang, variants exist)
1360	FIBUA	Fighting In Built-Up Areas
1361	FIC	Fellowship for Intentional Community
1362	FID	Foreign Internal Defence
1363	FIE	Fly-In Echelon
1364	FIFA	Fédération internationale de football association (French for: International Association Football Federation)
1365	FIFe	Fédération internationale féline (French for: International Feline Federation)
1366	FIFO	First In, First Out
1367	FIFRA	Federal Insecticide, Fungicide, and Rodenticide Act
1368	FIGJAM	Fuck I'm Good, Just Ask Me
1369	FIMPT	Fellow of the Institute of Maxillofacial Prosthetists and Technologists
1370	FIN	Finland (ISO 3166 trigram)
1371	FINA	Fédération internationale de natation (French for: International Swimming Federation)
1372	FIRES	Fever Induced Refractory Epilepsy Syndrome or Febrile Infection-Related Epilepsy Syndrome
1373	FIS	Fédération internationale de ski (French for: International Ski Federation)
1374	FISA	Fédération Internationale des Sociétés d'Aviron (French for: International Federation of Rowing Associations)
1375	FISH	Fluorescence In-Situ Hybridisation
1376	FiST	Fire Support Team
1377	FITS	Flexible Image Transport System
1378	FIU	Florida International University
1379	fJ	Femtojoule
1380	FJ	Fiji (ISO 3166 digram)
1381	FJI	Fiji (ISO 3166 trigram)
1382	FJN	Financial Job Network
1383	FK	Falkland Islands (ISO 3166 digram)
1384	fK	Femtokelvin
1385	FKSM	Fort Knox Supplemental Manual
1386	FKT	Fastest Known Time
1387	fL	Femtolitre
1388	FL	Florida (postal symbol)
1389	fl	floruit (Latin for: living) (genealogy)
1390	FLA	Florida,Front Line Assembly,Future Large Aircraft
1391	FLAB	Four-letter abbreviation
1392	FLAC	Free Legal Advice Centres
1393	FLAC	Free Lossless Audio Codec
1394	FLAK	Flug-Abwehr-Kanone (German for: Anti-Aircraft Guns)
1395	FLB	Forward Logistics Base
1396	FLET	Forward Line of Enemy Troops
1397	FLG	Falun Gong
1398	FLIP	Flight Information Publication
1399	FLIR	Forward Looking InfraRed (sensor)
1400	FLK	Falkland Islands (ISO 3166 trigram)
1401	FLOT	Forward Line of Own Troops
1402	FLOTUS	First Lady of the United States (the wife of the President of the United States)
1403	FLQ	Free Legal Questions
1404	FLQ	Front de libération du Québec (French for: Québec Liberation Front)
1405	FLSA	Fair Labor Standards Act
1406	FLTSAT	Fleet Satellite
1407	FLTSATCOM	Fleet Satellite Communication System
1408	FLUBOS	Fat, Lazy, Useless, Bag Of Shit
1409	FM	Factory Mutual
1410	FM	Federal Magistrate (Australian post-nominal),Federated States of Micronesia (postal symbol; ISO 3166 digram),Field Manual,Flight Manager,Frequency Modulation (electronics)
1411	fm	Femtometre
1412	Fm	Fermium
1413	FMC	Federal Magistrates' Court (an Australian federal court,formerly FMS),Food Machinery Corporation (original name of the company now known as FMC Corporation)
1414	FMCA	Federal Magistrates' Court of Australia (used for citing decisions of the FMC other than family law decisions)
1415	FMCAfam	Federal Magistrates' Court of Australia: family (used for citing family law decisions of the FMC)
1416	FMCG	Fast Moving Consumer Goods
1417	FME	Formal Methods Europe
1418	FMECA	Failure Modes and Effect Criticality Analysis
1419	FMJD	Fédération Mondiale du Jeu de Dames
1420	FMLA	Family Medical Leave Act
1421	FoE	Friends of the Earth
1422	FOGC	Federal Oil and Gas Council
1423	FOH	Front Of House
1424	FOIA	Freedom of Information Act
1425	FOM	Federation Object Model
1426	FONSI	Finding of No Significant Impact
1427	FOO	Forward Observation Officer
1428	FOOP	Friends Of Organ Pipes (Volunteer group)
1429	FoS	Family of Systems
1430	FOSE	Fallout 3 Script Extender
1431	FOSE	Federal Office Systems Expo
1432	FOT	Free on truck
1433	FOTA	Fellow of the Orthodontic Technicians Association
1434	FOTC	Flight of the Conchords
1435	FOUO	For Official Use Only
1436	FPF	Federação Portuguesa de Futebol (Portuguese for: Portuguese Football Federation), Final Protective Fire
1437	FPS	Fire Prevention System
1438	FQ	French Southern and Antarctic Territories (ISO 3166 digram; obsolete 1979)
1439	FR	France (ISO 3166 digram)
1440	Fr	Francium
1441	FRA	Federal Railroad Administration, France (ISO 3166 trigram)
1442	FRAND	Fair,reasonable,and non-discriminatory (concept in standards-setting and intellectual property law)
1443	FRCP	Federal Rules of Civil Procedure,Fellow of the Royal College of Physicians
1444	FRICBM	Full Range ICBM
1445	FRO	Faroe Islands (ISO 3166 trigram)
1446	FRS	Fellow of the Royal Society, U.S. Federal Reserve System
1447	FRSA	Fellow of the Royal Society of Art
1448	FRY	Federal Republic of Yugoslavia
1449	fs	Femtosecond
1450	fS	Femtosiemens
1451	FSA	Fire Support Area, UK Food Standards Agency, Functional Solution Analysis
1452	FSC	Federal Supply Classification, Forest Stewardship Council (ecological pressure group)
1453	FSCL	Fire Support Co-ordination Line
1454	FSE	Fire Support Element
1455	FSF	Free Software Foundation
1456	FSH	Follicle Stimulating Hormone
1457	FSI	Fuel Stratified Injection
1458	FSS	Fire Support Station
1459	FSSP	Families of Structurally Similar Proteins
1460	FSTC	Foreign Science Technology Center (now NGIC)
1461	fT	Femtotesla
1462	FTC	Federal Trade Commission
1463	FTE	Full Time Equivalent
1464	FTL	Faster Than Light
1465	FTS	Flight Termination System used during some rocket launches
1466	FTS	Fuck That Shit
1467	FU	Smoke (METAR Code)
1468	FUBAR	Fucked/Fouled Up Beyond All Recognition/Repair
1469	fV	Femtovolt
1470	fW	Femtowatt
1471	FW	Forward
1472	FWC	Football World Cup
1473	FWF	Fixed Word Format
1474	FWI	French West Indies
1475	FWIW	For What It's Worth
1476	FWS	U.S. Fish and Wildlife Service
1477	FWT	Fresh Water Tank
1478	FXX	Metropolitan France (ISO 3166 trigram; obsolete 1997)
1479	FYA	For Your Agenda
1480	FYDP	Five-Year Defense Plan (U.S.)
1481	FYI	For Your Information
1482	FYROM	Former Yugoslav Republic of Macedonia
1483	FZDZ	Freezing Drizzle (METAR Code)
1484	FZFG	Freezing Fog (METAR Code)
1485	FZRA	Freezing Rain (METAR Code)
1486	g	Gram
1487	G3	Heckler & Koch G3
1488	GAAR	General Anti-Avoidance Rule (tax evasion)
1489	GAB	Gabon (ISO 3166 trigram)
1490	GABA	Gamma-AminoButyric Acid
1491	GAD	Generalized Anxiety Disorder
1492	GAF	Garfield and Friends
1493	GAO	U.S. Government Accountability Office
1494	GAW	Global Atmospheric Watch
1495	GB	United Kingdom of Great Britain and Northern Ireland (ISO 3166 digram) [glamour boy 7-9/10]
1496	GBBC	Great (Global) Backyard Bird Count
1497	GBE	Knight/Dame Grand Cross of the Order of the British Empire
1498	GBR	United Kingdom of Great Britain and Northern Ireland (ISO 3166 trigram)
1499	GCA	Graduate in Claims Administration
1500	GCD	see entry
1501	GCF	Greatest Common Factor
1502	GCI	Ground-controlled interception
1503	GCN	Gamma-ray burst Coordination Network
1504	GCS	Global Coordinate System
1505	GCSE	General Certificate of Secondary Education (UK)
1506	Gd	Gadolinium
1507	GD	Grenada (ISO 3166 digram)
1508	GDL	Game Definition Language
1509	GDR	General Distribution Release (Microsoft Term for a software service release; between Hotfix and Service Pack)
1510	GDR	German Democratic Republic (cf. DDR)
1511	GDW	Game Designers Workshop
1512	Ge	Germanium
1513	GEBCO	General Bathymetric Chart of the Oceans
1514	GEC	Great Engineering Challenge
1515	GED	General Educational Development (high school equivalency credential in the U.S. and Canada)
1516	GEEP	Geophysical Equipment Exploration Platform
1517	GEN	Full General (four stars) in the U.S. Army
1518	GeV	Gigaelectron-volt
1519	GEV	Ground Effect Vehicle
1520	GFCI	Ground Fault Circuit Interruptor (aka GFI)
1521	GFI	Ground Fault Interruptor (aka GFCI)
1522	GFL	German Football League (Germany's Bundesliga for American football; the English-language name is used in German without translation)
1523	GFN	Global Footprint Network
1524	GFY	'good for you' or 'go fuck yourself', depending on the context (Internet chat)
1525	GGK	Good God Karma
1526	GHA	Ghana (ISO 3166 trigram)
1527	GHB	gamma-Hydroxybutyric acid
1528	Gi	Gibi
1529	GIB	Gibraltar (ISO 3166 trigram)
1530	GIG	Global Information Grid
1531	GINO	Godzilla In Name Only
1532	GISS	General Impression of Size and Shape,Goddard Institute for Space Studies
1533	GJ	Gigajoule,Gujarat (Indian state code)
1534	GJD	Geocentric Julian Day
1535	GK	Gigakelvin
1536	GLAAD	Gay and Lesbian Alliance Against Defamation
1537	GLAC	General Ledger Accounting Code
1538	GLAST	Gamma-ray Large Area Space Telescope
1539	GLBA	Gramm-Leach-Bliley Act
1540	GLC	Gas-liquid chromatography
1541	GLP	Guadeloupe (ISO 3166 trigram)
1542	GLV	Gained Life Value
1543	Gm	Gigametre
1544	GM	The Gambia (ISO 3166 digram),GameMaster (role-playing),General Motors,Genetically Modified,Guru Meditation (computing)
1545	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
1546	GMB	The Gambia (ISO 3166 trigram),General,Municipal,Boilermakers (and Allied Trade Union)
1547	GMFSC	Ground Mobile Forces Satellite Communications
1548	GMO	Genetically Modified Organism
1549	GMPCS	Global Mobile Personal Communications by Satellite
1550	GNAS	Grand National Archery Society
1551	GNB	Guinea-Bissau (ISO 3166 trigram)
1552	GNP	Gross National Product
1553	GNQ	Equatorial Guinea (ISO 3166 trigram)
1554	GnRH	Gonadotropin-Releasing Hormone
1555	GOA	General of the Army (United States only)
1556	GOAT	Greatest Of All Time
1557	GOC	General Officer Commanding
1558	GOES	Geostationary Operational Environmental Satellite
1559	GOP	Grand Old Party
1560	gorp	granola,oats,raisins,peanuts (another name for trail mix),probably a backronym
1561	GOSC	General Officer Steering Committee
1562	GOSH	Great Ormond Street Hospital
1563	GOSP	Gas/Oil Separation Plant
1564	GOTS	Government off-the-shelf
1565	GOYADIN	Get Off Your Arse,Do It Now (anti-procrastination mantra)
1566	GP	General Practitioner,General Purpose,Grand Prix,Guadeloupe (ISO 3166 digram)
1567	GPA	Grade Point Average
1568	GPC	Global Path Cache
1569	GPIB	General-Purpose Instrumentation/Interface Bus
1570	GPO	General Post Office
1571	GPPC	Genetics and Public Policy Center
1572	GPR	Ground-Penetrating Radar
1573	GPS	General Problem Solver,Global Positioning System
1574	GPT	General Purpose Technology, Get paid to surf (an online business model)
1575	GQ	Equatorial Guinea (ISO 3166 digram),Gentlemen's Quarterly (the original name of the magazine now known simply as GQ),GR[edit]
1576	GR	Greece (ISO 3166 digram),Hail (METAR Code)
1577	GRAIL	Gravity Recovery and Interior Laboratory
1578	GRAS	Generally recognized as safe (FDA list)
1579	GRB	Gamma-Ray Burst
1580	GRC	Greece (ISO 3166 trigram)
1581	GRD	Grenada (ISO 3166 trigram)
1582	GRE	Graduate Record Examination,Greece (IOC and FIFA trigram,but not ISO 3166)
1583	grep	[search] Globally for Regular Expression,Print [lines]
1584	GRID	Gay-Related Immune Deficiency (original name of AIDS)
1585	GRid	Global Release Identifier,a music industry identifier from the RIAA and IFPI
1586	GriT	Girl raised in Texas (Woman presenting firm southern traits/beliefs)
1587	GRL	Greenland (ISO 3166 trigram)
1588	GRN	Grenada (IOC and FIFA trigram,but not ISO 3166),Goods Received Note
1589	Gs	Gigasecond
1590	GSA	U.S. General Services Administration
1591	GSD	Graphical Situation Display
1592	GSGB	(God send glamour boy 9-10/10)
1593	GSK	GlaxoSmithKline [good sexual karma]
1594	GSN	Game Show Network
1595	GSO	General Services Officer (U.S. Department of State)
1596	GSOH	Good Sense Of Humour
1597	GSP	Georges St-Pierre (Canadian MMA fighter)
1598	GSR	Gun Shot Residue
1599	GSS	Generic Security Services
1600	GSW	Gunshot wound
1601	GTD	Getting Things Done
1602	GTG	Got To Go (Internet chat)
1603	GTGN	Getty Thesaurus of Geographic Names
1604	GTK	Good To Know (Internet chat)
1605	GTM	Guatemala (ISO 3166 trigram)
1606	GU	Guam (postal symbol; ISO 3166 digram)
1607	GUF	French Guiana (ISO 3166 trigram)
1608	GUILT	Gangliated Utrophin Immuno Latency Toxin
1609	GULCR	Grupo de Usuarios de Linux de Costa Rica
1610	GUT	Grand Unification Theory
1611	GV	Gigavolt
1612	GWARS	Ground Warfare System (simulation)
1613	GWAS	Grand Western Archery Society
1614	GWOT	Global War on Terrorism
1615	GXE	Gene-enivronment interaction
1616	GXM	Matrox Graphics eXpansion Module
1617	GY	Guyana (ISO 3166 digram)
1618	GZ	Ground Zero
1619	GZK	Greisen-Zatsepin-Kuzmin cut-off (cosmic ray energies)
1620	h	Hecto
1621	H	Henry
1622	H1	First half of the year
1623	H2	Second half of the year
1624	HA	High Availability
1625	HAARP	High Frequency Active Auroral Research Program
1626	HAART	Highly Active Anti-Retroviral Therapy
1627	HAI	Human Awareness Institute
1628	HAL	Hardware Abstraction Layer
1629	HALO	High Altitude Low Opening (parachute jump)
1630	HAM	Amateur radio operator
1631	HANS	Head And Neck Support (device used in many race cars)
1632	HARM	High-speed Anti-Radiation Missile
1633	HAW	Heavy Antitank Weapon
1634	HAWK	Homing All the Way Killer (air defence system)
1635	HAZ	Heat-Affected Zone
1636	HAZMAT	Hazardous Materials
1637	HBCD	HexaBromoCycloDodecane
1638	HBO	Home Box Office
1639	HBR	Harvard Business Review
1640	HBT	Heterojunction Bipolar Transistor
1641	HBV	Hepatitis B Virus
1642	HCCI	Homogeneous Charge Compression Ignition
1643	HCF	Highest Common Factor
1644	HCSC	Higher Command and Staff Course
1645	HDL	High-Density Lipoprotein
1646	HDM	Human Decision-Making
1647	HDRA	Henry Doubleday Research Association
1648	He	Helium
1649	HE	High Explosive
1650	HEAT	High Explosive Anti-Tank (ammunition)
1651	HEBA	Hellenic Basketball Clubs Association
1652	HEER	High-Explosive Extended Range (ammunition)
1653	HEIC	Honourable East India Company
1654	HEMP	High-Altitude Electromagnetic Pulse
1655	HEOSS	High Earth Orbit Space Surveillance
1656	HEP	High-Explosive Plastic (ammunition)
1657	HEPA	High-Efficiency Particulate Air (filter)
1658	HESV	Heavy Engineering Support Vehicle
1659	HETT	Heavy Equipment Transporting Truck / Heavy Equipment Truck Tractor
1660	HEU	Highly Enriched Uranium
1661	Hf	Hafnium
1662	HF	High Frequency
1663	HFE	Human Fertilisation and Embryology (UK Act)
1664	HFE	The common-emitter current gain in a BJT transistor (also represented by βF). See: BJT
1665	HFEA	Human Fertilisation and Embryology Authority (UK)
1666	Hg	Mercury (Latin Hydrargyrum)
1667	HGC	UK Human Genetics Commission
1668	HGF	Human Growth Factor
1669	HGTV	Home & Garden Television
1670	HI	Hawaii (postal symbol)
1671	HIH	His (or Her) Imperial Highness
1672	HIM	His (or Her) Imperial Majesty
1673	HIMAD	High to Medium Altitude Air Defence (see also H/MAD)
1674	HIMEZ	High Altitude Missile Engagement Zone
1675	HIMYM	How I Met Your Mother
1676	HIPAA	U.S. Health Insurance Portability and Accountability Act
1677	Hipparcos	HIgh Precision Parallax COllecting Satellite
1678	Hird	Hurd of interfaces representing depth (cf. HURD)
1679	HiRISE	High Resolution Imaging Science Experiment
1680	HIT	Health Information Technology
1681	HIV	Human Immunodeficiency Virus
1682	HIWT	Hobart Institute of Welding Technology
1683	HJD	Heliocentric Julian Day
1684	HK	Hong Kong (ISO 3166 digram)
1685	HKG	Hong Kong (ISO 3166 trigram)
1686	HKS	HyperKinetic Syndrome
1687	hL	Hectolitre
1688	HL	Holding Line
1689	HLL	High-Level Language
1690	HLN	Headline News
1691	HLOS	High Level Output Specification
1692	HM	Heard Island and McDonald Islands (ISO 3166 digram)
1693	HMCE	Her/His Majesty's Customs and Excise (former UK government department; succeeded by HM Revenue and Customs)
1694	HMD	Heard and McDonald Islands (ISO 3166 trigram)
1695	HMF	HydroxyMethyl Furfural
1696	HMO	Health maintenance organization
1697	HMP	Her Majesty's Prison
1698	HMRC	Her/His Majesty's Revenue and Customs
1699	HMSO	Her Majesty's Stationery Office
1700	HMV	His Master's Voice
1701	HN	Honduras (ISO 3166 digram)
1702	HND	Honduras (ISO 3166 trigram)
1703	Ho	Holmium
1704	HOLLAND	Hope Our Love Lasts And Never Dies
1705	HOSTAC	Helicopter Operations from Ships Other Than Aircraft Carriers
1706	HOT	Highly Optimised Tolerance
1707	HOTAS	Hands on throttle-and-stick
1708	HOV	High Occupancy Vehicle
1709	hp	horse power
1710	HPA	UK Health Protection Agency
1711	HPCL	Hindustan Petroleum Corporation Limited
1712	HPLC	High Performance Liquid Chromatography
1713	HPT	High[er] Payoff Target
1714	HPV	Human Papilloma Virus
1715	HQ	HeadQuarters
1716	HRBL	High-level Representation of Behavior Language (original name of the Herbal language)
1717	HRD	Human Resource Development
1718	HRF	High iness Forces
1719	HRH	His (or Her) Royal Highness
1720	HRM	His (or Her) Royal Majesty
1721	HRM	Human Resource Management
1722	HRT	Hormone Replacement Therapy
1723	Hs	Hassium
1724	HSBC	The Hong Kong and Shanghai Banking Corporation
1725	HSC	Higher School Certificate
1726	HSM	High School Musical
1727	HSMAD	Human Science/Modeling and Analysis Data
1728	HSN	Home Shopping Network
1729	HSPH	Harvard School of Public Health
1730	HSSI	High-Speed Serial Interface
1731	HST	see entry
1732	HTA	HyperText Application
1733	HTFU	Harden The Fuck Up
1734	HTH	Hope That Helps
1735	HTI	Haiti (ISO 3166 trigram)
1736	HTR	Heated Towel Rail
1737	HTS	High-Temperature Superconducting wire
1738	HTTP	HyperText Transfer Protocol
1739	HU	Hungary (ISO 3166 digram)
1740	HUHA	Head up his/her ass (Marine salute; probably a backcronym)
1741	HUN	Hungary (ISO 3166 trigram)
1742	HURD	Hird of Unix-Replacing Daemons (cf. Hird)
1743	HV	Upper Volta (ISO 3166 digram; obsolete 1984)
1744	HVAP	High Velocity Armour Piercing (ammunition)
1745	HVHF	High velocity human factors
1746	HVM	High Velocity Missile
1747	HVO	Upper Volta (ISO 3166 trigram; obsolete 1984)
1748	HWM	Hardware morphing (computer graphics rendering)
1749	HXB	The glycoprotein Tenascian C
1750	HZ	Haze (METAR Code)
1751	Hz	Hertz
1752	IA	Iowa (postal symbol)
1753	IAAL	I Am A Lawyer
1754	IAB	International Association for Biologicals
1755	IAD	Ion Assisted Deposition
1756	IADS	Integrated Air Defence System
1757	IAEA	International Atomic Energy Agency
1758	IAF	{i} Industrial Areas Foundation
1759	IAFG	Information Assurance Focus Group
1760	IANA	Internet Assigned Numbers Authority
1761	IANAL	I Am Not A Lawyer
1762	IAS	Image Assessment System
1763	IASIP	It's Always Sunny in Philadelphia
1764	IATA	International Air Transport Association
1765	IATF	International Automotive Task Force
1766	IATSE	International Alliance of Theatrical Stage Employees
1767	IAUC	International Astronomical Union Circular
1768	IAW	In Accordance With
1769	IB	International Baccalaureate
1770	IBA	Important Bird Area
1771	IBD	Inflammatory Bowel Disease
1772	IBDM	Information Based Decision Making
1773	IBM	International Business Machines
1774	IBRD	International Bank for Reconstruction and Development (part of the World Bank)
1775	IBS	Irritable Bowel Syndrome
1776	IC	Ice Crystals (METAR Code),Integrated Circuit,[inner circle]
1777	ICANN	Internet Corporation for Assigned Names and Numbers
1778	ICAO	International Civil Aviation Organization
1779	ICBM	Intercontinental Ballistic Missile
1780	ICBN	International Code of Botanical Nomenclature
1781	ICE	In case of emergency, Immigration and Customs Enforcement
1782	ICES	International Council for the Exploration of the Sea
1783	ICF	Intelligent Community Forum
1784	ICMP	Internet Control Message Protocol
1785	ICNAF	International Commission for the Northwest Atlantic Fisheries (became NAFO in 1978)
1786	ICO	Intermediate Circular Orbit
1787	ICPE	International Conference on Pharmacoepidemiology,the annual conference of the International Society for Pharmacoepidemiology
1788	ICRAF	International Centre for Research in Agroforestry (a.k.a. World Agroforestry Centre since 2002)
1789	ICRISAT	International Crops Research Institute for the Semi-Arid Tropics
1790	ICRL	Individual Component Repair List
1791	ICRS	International Celestial Reference System
1792	ICSI	Intracytoplasmic Sperm Injection
1793	ICT	Information and communication technologies
1794	ICTH	Island Closest to Heaven/Hell Final Fantasy VIII
1795	ICV	Infantry Carrier Vehicle
1796	ICYMI	In Case You Missed It
1797	ID	Idaho (postal symbol),Identity,Indonesia (ISO 3166 digram),Infantry Division,Intelligent Design,ID10T Error,Idiot User Error (IT help desk inside joke)
1798	IDC	International Data Corporation
1799	IDDI	I don't do initialisms (see irony)
1800	IDGAF	I don't give a fuck
1801	IDK	I don't know
1802	IDL	Interface Definition Language
1803	IDN	Indonesia (ISO 3166 trigram)
1804	IEA	International Energy Agency
1805	IEC	International Electrotechnical Commission
1806	IED	Improvised Explosive Device
1807	IELTS	International English Language Testing System
1808	IER	Information Exchange Requirement
1809	IET	Initial Entry Training
1810	IET	Institution of Engineering and Technology
1811	IETF	Internet Engineering Task Force
1812	IEW	Intelligence and Electronic Warfare
1813	IFAB	International Football Association Board
1814	IFAH	International Federation for Animal Health
1815	IFAP	International Federation of Agricultural Producers
1816	IFO	Identified Flying Object (see also UFO)
1817	IFOV	Instantaneous Field of View
1818	IFPI	International Federation of Phonographic Industries
1819	IFRB	International Frequency Registration Board
1820	IFV	Infantry Fighting Vehicle
1821	IG	Inspector General
1822	IGNOU	Indira Gandhi National Open University
1823	IGS	International Ground Station
1824	IHH	Idiopathic Hypogonadotropic Hypogonadism
1825	IHO	International Hydrographic Organization
1826	IHR	Institute for Historical Review
1827	IHSI	Institutum Historicum Societatis Iesu (Jesuit Historical Institute)
1828	II	Two (in Roman numerals)
1829	IICA	Inter-American Institute for Cooperation on Agriculture
1830	IIE	Innovative Interstellar Explorer
1831	III	Three (in Roman numerals)
1832	IIRC	If I Recall/Remember Correctly
1833	IISS	International Institute for Strategic Studies
1834	IJN	Imperial Japanese Navy (World War II)
1835	IJWP	Interim Joint Warfare Publication
1836	ILDS	Improved Landmine Detection System
1837	ILO	International Labour Organization
1838	ILRI	International Livestock Research Institute
1839	ILY	I Love You [pronounced ILL-LEE]
1840	IM	Instant Message (internet speech)
1841	IMBD	International Migratory Bird Day
1842	IMDb	Internet Movie Database
1843	IME	In My Experience
1844	IMHO	In My Humble/Honest Opinion
1845	IML	International Mister Leather
1846	IMNSHO	In My Not So Humble Opinion
1847	IMPAC	International Merchant Purchase Authorization Card
1848	IMPACT	International Medical Products Anti-Counterfeiting Taskforce
1849	IMPATT	IMPact Avalanche Transit Time diode
1850	IMPT	Institute of Maxillofacial Prosthetists and Technologists
1851	IMRL	Individual Material iness List
1852	IMRO-Internal Macedonian Revolutionary Organization	Irish Music Rights Organisation
1853	IMsL	International Ms. Leather
1854	IMT	Integrated Management Tool
1855	IMU	International Mathematical Union
1856	IN	India (ISO 3166 digram),Indiana (postal symbol),Infantry
1857	In	Indium
1858	INA	Immigration and Nationality Act
1859	INAS	International Near-Earth Asteroid Survey
1860	INCITS	InterNational Committee for Information Technology Standards
1861	IND	India (ISO 3166 trigram)
1862	INDIGO	(U.S.) INtelligence DIvision Gaming Operation
1863	inet	the Internet
1864	INFORMS	(U.S.) Institute for Operations Research and the Management Sciences
1865	INFOSEC	Information Security
1866	INLA	Irish National Liberation Army
1867	INMARSAT	International Maritime Satellite organization
1868	INRIA	Institut national de recherche en informatique et en automatique
1869	INS	Immigration and Naturalization Service
1870	InSAR	Interferometric synthetic aperture radar
1871	INST	Information Standards and Technology
1872	INTERFET	International Force for East Timor
1873	INTSUM	Intelligence Summary
1874	IO	British Indian Ocean Territory (ISO 3166 digram)
1875	IOT	British Indian Ocean Territory (ISO 3166 trigram)
1876	IPB	Intelligence Preparation of the Battlefield
1877	IPL	Inferior Parietal Lobule
1878	IPO	Initial Public Offering
1879	IPT	Integrated Product/Project Team
1880	IPTS	Institute for Prospective Technological Studies
1881	IPTV	Internet Protocol TeleVision
1882	IPW	Interrogation of Prisoners of War
1883	Ir	Iridium
1884	IRAD	Internal Research and Development
1885	IRAN	(I) Inspect and Repair As Necessary
1886	IRAS	Infrared Astronomical Satellite
1887	IRB	International Rugby Board
1888	IRBM	Intermediate Range Ballistic Missile
1889	IREA	Intermountain Rural Electric Association
1890	IRINN	Islamic Republic of Iran News Network
1891	IRL	Ireland (ISO 3166 trigram),Industrial Research Limited,Indy Racing League,In real life
1892	IRN	Iran (ISO 3166 trigram)
1893	IRO	International Refugee Organisation
1894	IRQ	Iraq (ISO 3166 trigram)
1895	IRS	U.S. Internal Revenue Service
1896	IRST	Infra-red Search and Track
1897	IS	Iceland (ISO 3166 digram)
1898	ISAAA	International Service for the Acquisition of Agri-biotech Applications
1899	ISAR	Inverse SAR (Synthetic Aperture Radar)
1900	ISB	Intermediate Staging Base
1901	ISBN	International Standard Book Number (ISO 2108)
1902	ISCCP	International Satellite Cloud Climatology Project
1903	ISCII	Indian Standard Code for Information Interchange
1904	ISDN	Integrated Services Digital Network
1905	ISEF	Intel International Science and Engineering Fair
1906	ISEN	Internet Search Environment Number
1907	ISF	Internal Security Force
1908	ISIL	Islamic State of Iraq and the Levant
1909	ISIS	Institute for Science and International Security, or: Islamic State of Iraq and Syria
1910	ISL	Iceland (ISO 3166 trigram)
1911	ISLN	International Standard Lawyer Number (used initially by LexisNexis Martindale-Hubbell)
1912	ISMB	International Society of Matrix Biologists
1913	ISMC	Intelligent Sounding Meaningless Conversation
1914	ISOGP	Indian Society of Orthodontics for General Practitioners [2]
1915	ISPE	International Society for Pharmacoepidemiology
1916	ISRO	Indian Space Research Organisation
1917	ISSCR	International Society for Stem Cell Research
1918	ISSN	International standard serial number (ISO 3297)
1919	ISTC	Institute of Scientific and Technical Communications (UK)
1920	ISTS	Intel Science Talent Search
1921	ITA	Italy (ISO 3166 trigram)
1922	ITAG	Inertial Terrain-Aided Guidance
1923	ITALY	I'll Truly Always Love You
1924	ITAS	Improved Target Acquisition Sight
1925	ITC	InferoTemporal Cortex (neurophysiology)
1926	ITCZ	Intertropical Convergence Zone
1927	ITEC	Information Technology Exposition & Conference
1928	ITEMS	Interactive Tactical Environment Management System
1929	ITER	International Thermonuclear Experimental Reactor
1930	ITF	International Tennis Federation
1931	ITK	In The Know
1932	ITN	Independent Television News (British)
1933	ITT	International Telephone and Telegraph (U.S.)
1934	ITTO	International Tropical Timber Organization
1935	IUCN	International Union for the Conservation of Nature and Natural Resources (World Conservation Union)
1936	IV	Four (in Roman numerals),IntraVenous (as in intravenous drip or intravenous therapy)
1937	Iveco	Industrial Vehicles Corporation
1938	IVF	In Vitro Fertilisation
1939	IVI	Interchangeable Virtual Instrument
1940	IVIS	Inter-Vehicle Information System
1941	IVL	Inter-Visibility Line
1942	IVM	In Vitro [Oocyte] Maturation
1943	IVO	In Vicinity Of
1944	IW	Information Warfare
1945	IWARS	Infantry Warrior Simulation
1946	IWC	International Whaling Commission
1947	IWW	Industrial Workers of the World
1948	IX	Nine (in Roman numerals)
1949	IXT	IntraText digital library; IntraText lexical hypertext
1950	J	Joule
1951	J1	Joint [Manpower &] Personnel Directorate
1952	J2	Joint Intelligence Directorate
1953	J3	Joint Operations Directorate
1954	J4	Joint Logistics Directorate
1955	J5	Joint Strategic Plans & Policy Directorate
1956	J7	Joint Operational Plans & Interoperability Directorate
1957	JAFT	Just A Field Test
1958	JAL	Japan Airlines
1959	JALLC	Joint Analysis and Lessons Learned Centre (NATO)
1960	JAM	Jamaica (ISO 3166 trigram)
1961	JAMA	Journal of the American Medical Association
1962	JANET	Joint Academic Network
1963	JATO	Jet-Assisted Take-Off
1964	JB	Jail Bait
1965	JB	Junior Branch
1966	JBFSA	Joint Blue Force Situational Awareness
1967	JCDB	Joint Common Data Base
1968	JCDS	Joint Chiefs of the Defence Staff
1969	JCIDS	Joint Capabilities Integration and Development System
1970	JCL	Job Control Language
1971	JCP	Java Community Process
1972	JCS	Joint Chiefs of Staff
1973	JCW	Juggalo Championship Wrestling
1974	JDBC	Java Data Base Connectivity
1975	JDEM	Joint Dark Energy Mission
1976	JDL	Jewish Defense League
1977	JEFX	Joint Expeditionary Force eXperiment
1978	JET	Joint European Torus
1979	JEZ	Joint Engagement Zone
1980	JFACC	Joint Force Air Component Commander
1981	JFACTSU	U.S. Joint Forward Air Control Training and Standards Unit
1982	JFC	Joint Force Commander
1983	JFK	John Fitzgerald Kennedy or the airport named after him.
1984	JFLCC	Joint Force Land Component Commander
1985	JFMCC	Joint Force Maritime Component Commander
1986	JFO	Journal of Field Ornithology
1987	JFSOCC	Joint Force Special Operations Component Commander
1988	JFTX	Joint Field Training Exercise
1989	JH	Japan Highway Public Corporation
1990	JH	Jharkhand (Indian state code)
1991	JI	Joint Implementation
1992	JIB	Joint Information Bureau
1993	JIC	Joint Intelligence Centre
1994	JINI	Java Intelligent Network Infrastructure
1995	JITC	Joint Interoperability Test Command
1996	JIVE	Joint Institute for VLBI (Very Long Baseline Interferometry) in Europe
1997	JJAP	Japanese Journal of Applied Physics
1998	JL	Japan Airlines (IATA airline designator)
1999	JLA	Justice League of America
2000	JM	Jamaica (ISO 3166 digram)
2001	JMS	Java Message Service
2002	JO	Jordan (ISO 3166 digram)
2003	JOA	Joint Operations Area
2004	JOPES	Joint Operations Planning and Execution System
2005	JOR	Jordan (ISO 3166 trigram)
2006	JOTS	Joint Operations Tactical System
2007	JPL	Jet Propulsion Laboratory
2008	JPN	Japan (ISO 3166 trigram)
2009	JPOW	Joint Project Optic Windmill
2010	JRDF	Joint Rapid Deployment Forces
2011	JRE	Java Runtime Environment
2012	JREF	James Randi Educational Foundation
2013	JROC	Joint Requirements Oversight Council
2014	JROCM	JROC Memorandum
2015	JRRF	Joint Rapid Reaction Force
2016	JRSAI	Journal of the Royal Society of Antiquaries of Ireland
2017	JSAP	Japan Society of Applied Physics
2018	JSCSC	Joint Services Command and Staff College
2019	JSEAD	Joint Suppression of Enemy Air Defence (see SEAD)
2020	JSF	Joint Strike Fighter
2021	JSIMS	Joint Simulation System
2022	JSOA	Joint Special Operations Area
2023	JSOTF	Joint Special Operations Task Force
2024	JSP	JavaServer Page
2025	JSP	Joint Services Publication
2026	JSR	Java Specification Request
2027	JSS	Joint Support Ship Project
2028	JTC	Joint Training Confederation
2029	JTF	Joint Task Force
2030	JTFEX	Joint Task Force Exercise
2031	JTLS	Joint Theater Level Simulation
2032	JTMD	Joint Theatre Missile Defence
2033	JTN	Johnston Atoll (ISO 3166 trigram; obsolete 1986)
2034	JUGFET	JUnction Gate Field-Effect Transistor
2035	JUICE	JUpiter ICy Moon Explorer
2036	JUO	Joint Urban Operations
2037	JV	Joint Venture,Junior Varsity
2038	JW	Jehovah's Witnesses
2039	JWARS	Joint Warfare System (simulation)
2040	JWP	Joint Warfare Publication
2041	JY	Japanese Yen
2042	JZ	Joint Zone
2043	K	Kelvin,Potassium (Latin Kalium),Tanker (aircraft designation code)
2044	k	Kilo-
2045	K	picokelvin
2046	K9	Canine Police Unit
2047	Ka	Kamov Design Bureau
2048	kA	Kiloampere
2049	KA	Knowledge Acquisition,Karnataka (Indian state code)
2050	KAF	Kandahar Air Field
2051	KANUKOKA	Kalaallit Nunaanni Kommunit Kattuffiannit (Kalaallisut, Greenlandic Communities Association
2052	KARNAC	Knowledge Aided Retrieval in Activity Context
2053	KARR	Knight Automated Roving Robot (Knight Rider character)
2054	KATUSA	Korean Augmentation To United States Army
2055	KAZ	Kazakhstan (ISO 3166 trigram)
2056	KBE	Knight Commander of the Order of the British Empire
2057	KBO	Kuiper Belt Object
2058	KBVB	Koninklijke Belgische Voetbalbond (Dutch for Royal Belgian Football Association)
2059	kC	Kilocoulomb
2060	KCK	Kansas City,Kansas,Koma Civakên Kurdistan (Kurdish, Union of Communities in Kurdistan)
2061	KCL	King's College London
2062	KCMO	Kansas City,Missouri (pronounced: K-C-Moe)
2063	KCS	Kansas City Southern Railway (AAR reporting mark)
2064	KD	Kawasaki Disease,Kraft Dinner
2065	KE	Kenya (ISO 3166 digram),Kinetic Energy,Knowledge Engineering
2066	KEDO	Korean Peninsula Energy Development Organization
2067	KEN	Kenya (ISO 3166 trigram)
2068	KERA	Kentucky Education Reform Act (of 1990)
2069	kerma	Kinetic Energy Released in MAterial / in MAtter / per unit MAss
2070	KESR	Kent and East Sussex Railway.
2071	KET	Kentucky Educational Television,Key English Test
2072	kF	Kilofarad
2073	KFC	Kentucky Fried Chicken
2074	KFOR	UN Kosovo Force
2075	KFUPM	King Fahd University of Petroleum & Minerals
2076	KG	Kyrgyzstan (ISO 3166 digram)
2077	KGO	Knight of the Guelphic Order of Hanover
2078	KGZ	Kyrgyzstan (ISO 3166 trigram)
2079	KH	Cambodia (ISO 3166 digram)
2080	kH	Kilohenry
2081	KHL	Kontinental Hockey League
2082	KHM	Cambodia (ISO 3166 trigram)
2083	KHz	Kilohertz
2084	Ki	Kibi
2085	KI	Kiribati (ISO 3166 digram)
2086	KIA	Killed In Action
2087	KIDS	Knowledge-based Integrated Design System
2088	KIR	Kiribati (ISO 3166 trigram)
2089	KISS	Keep It Simple,Stupid / Keep It Short and Simple,Korean Intelligence Support System
2090	KIT	Keep In Touch
2091	KITECH	Korean Institute of Industrial Technology
2092	KITT	Knight Industries Two Thousand, Knight Industries Three Thousand
2093	kJ	Kilojoule
2094	kK	Kilokelvin
2095	KKK	Ku Klux Klan
2096	kL	Kilolitre
2097	KLENOT	KLEť Observatory Near Earth and Other unusual objects observations Team and Telescope
2098	KLOC	Kilo Lines Of Code
2099	KM	Comoros,Knowledge Management
2100	kN	Kilonewton
2101	KNA	Saint Kitts and Nevis (ISO 3166 trigram)
2102	KNVB	Koninklijke Nederlandse Voetbal Bond (Dutch for Royal Dutch Football Association)
2103	KO	Knocked Out
2104	KOR	Republic of Korea (ISO 3166 trigram)
2105	KP	Kim Possible
2106	KPMG	Klynveld,Peat,Marwick,Goerdeler
2107	KPNO	Kitt Peak National Observatory
2108	KQ	Kenya Airways (IATA airline designator)
2109	KR	Kiribati (FIPS 10-4 country code), Republic of Korea (ISO 3166 digram)
2110	Kr	Krypton
2111	KS	Kansas (postal symbol)
2112	kS	Kilosiemens
2113	KSC	Kennedy Space Center
2114	KSI	Killed or Seriously Injured
2115	KSU	Kansas State University
2116	KT	Knight of the Order of the Thistle, Knights Templar
2117	kT	Kilotesla
2118	KTS	Knight of the Tower and Sword (of Portugal)
2119	KUW	Kuwait (UNDP country code,IOC and FIFA trigram,but not ISO 3166)
2120	kV	Kilovolt
2121	KV	Kosovo
2122	kW	Kilowatt
2123	KW	Kuwait (ISO 3166 digram)
2124	KWB	Kids' WB!
2125	KWT	Kuwait (ISO 3166 trigram)
2126	KX	Cayman Airways (IATA airline designator)
2127	KY	Cayman Islands (ISO 3166 digram), Kentucky (postal symbol)
2128	KZ	Kazakhstan (ISO 3166 digram)
2129	KZN	KwaZulu-Natal
2130	La	Lanthanum
2131	LA	Laos (ISO 3166 digram), Louisiana (postal symbol), Los Angeles
2132	LAAS	Local Area Augmentation System, Los Angeles Astronomical Society
2133	LAB	Logistics Assault Base
2134	LabVIEW	Laboratory Virtual Instrumentation Engineering Workbench
2135	LACMA	Los Angeles County Museum of Art
2136	LAD	Laser Aiming Device
2137	LADW	Local Air Defence Warning
2138	LAESI	Local Authority & Emergency Service Information
2139	LANL	Los Alamos National Laboratory
2140	LAO	Laos (ISO 3166 trigram)
2141	LAR	Light Armoured Reconnaissance, Logistics Assistance Representative
2142	LARC	Livermore Advanced Research Computer (cf. LLNL)
2143	LARP	Live-Action Role-Playing
2144	Laser	Light Amplification by Stimulated Emission of Radiation (cf. Maser)
2145	LAT	Lowest Astronomical Tide (nautical charts),Licensed Athletic Trainer (used in many of the United States; see www.oata.org)
2146	LATA	Local Access Transport Area
2147	LATCH	Lower Anchors and Tethers for Children (U.S. standard for attachment points for child safety seats in passenger cars)
2148	LAV	Land Assault Vehicle, Light Armoured Vehicle, Lymphadenopathy-Associated Virus
2149	LAW	Light Antitank Weapon
2150	LAX	Los Angeles International Airport, The Latin American Xchange (professional wrestling)
2151	LB	Lebanon (ISO 3166 digram)
2152	LBH	Light Battlefield Helicopter, Lyman-Birge-Hopfield bands
2153	LBJ	Lady Bird Johnson,LeBron James,Light Bulb Joke,Little Beagle Johnson (the dog owned by Lyndon and Lady Bird Johnson),Lyndon Baines Johnson
2154	LBN	Lebanon (ISO 3166 trigram)
2155	LBNL	Lawrence Berkeley National Laboratory
2156	LBR	Liberia (ISO 3166 trigram)
2157	LBS	Location-Based Services
2158	LBT	Large Binocular Telescope
2159	LBW	Leg Before Wicket
2160	LBY	Libya (ISO 3166 trigram)
2161	LCA	Saint Lucia (ISO 3166 trigram)
2162	LCC	Land Component Commander
2163	LCCP	Light Contingency Communications Package
2164	LCD	Liquid Crystal Display
2165	LCM	Least/Lowest Common Multiple
2166	LCS	League of Legends Championship Series
2167	LDA	Lateral Drift Apparatus (paratroops)
2168	LDC	Lesser Developing/Developed Country
2169	LDL	Low-Density Lipoprotein
2170	LDV	Local Defence Volunteers (British Home Guard)
2171	LDW	Lane Departure Warning (ADAS)
2172	LEC	Local Exchange Carrier
2173	LED	Light-Emitting Diode
2174	LEGAD	Legal Advice
2175	Legs	level emotion gad speed
2176	LEMOSS	Long-Endurance MObile Submarine Simulator
2177	LEN	Large Extension Node
2178	LEP	Large Electron-Positron collider
2179	LER	Loss-Exchange Ratio
2180	LEU	Low-Enriched Uranium
2181	LF	Low Frequency
2182	LFO	Low Frequency Oscillation / Oscillator
2183	LFTR	Liquid fluoride thorium reactor
2184	LGB	Lesbian,Gay,Bisexual
2185	LGBT	Lesbian,Gay,Bisexual,Transgender
2186	LGBTQ	Lesbian,Gay,Bisexual,Transgender,Queer
2187	LGLO	Love God,Love Others
2188	LGM	Little Green Men
2189	LGS	Landsat Ground Station
2190	LH	Luteinising Hormone
2191	LHC	Large Hadron Collider
2192	LHS	Left Hand Side
2193	LI	Fifty-one (in Roman numerals),Liechtenstein (ISO 3166 digram)
2194	Li	Lithium
2195	LIBOR	London Interbank Offered Rate
2196	LIBS	Laser Induced Breakdown Spectroscopy
2197	LIE	Liechtenstein (ISO 3166 trigram)
2198	LIGO	Laser Interferometer Gravitational-Wave Observatory
2199	LINEAR	Lincoln Near-Earth Asteroid Research
2200	LISA	Laser Interferometer Space Antenna
2201	LIVE	Liquid Inertial Vibration Eliminator
2202	LJJ	Lord Justices of Appeal
2203	LK	Sri Lanka (ISO 3166 digram)
2204	LKA	Sri Lanka (ISO 3166 trigram)
2205	LKR4	Linkwitz-Riley 4th order (audio crossover type)
2206	LLAD	Low Level Air Defence
2207	LLB	Legum Baccalaureus (Latin: Bachelor of Laws)
2208	LLC	Limited Liability Company
2209	LLLTV	Low-Light Level Television
2210	LLNL	Lawrence Livermore National Laboratory
2211	LLP	Limited Liability Partnership
2212	LLTR	Low-Level Transit Route
2213	LMAO	Laughing My Ass Off (Internet shorthand)
2214	LMB	Lick My Balls
2215	LMFAO	Laughing My F**king Ass Off (Internet shorthand,electro-hop duo)
2216	LMN	Lifetime Movie Network
2217	LMS	Like My Status (Internet shorthand)
2218	LMV	() Light Motor Vehicle
2219	LNER	London and North Eastern Railway
2220	LNG	Liquefied Natural Gas
2221	LNO	Liaison Officer
2222	LNR	Ligue Nationale de Rugby (French for: 'National Rugby League')
2223	LOA	Limit Of Advance
2224	LOC	Level of Operational Capability, Limited Operational Capability
2225	LOD	Limit of Detection,see Detection limit
2226	LoD	Lines of Development (UK)
2227	LOFAR	Low Frequency Analysis and Recording
2228	LOGPAC	Logistics Package
2229	LOL	Laughing Out Loud (Internet shorthand)
2230	LOMEZ	Low Altitude Missile Engagement Zone
2231	LONEOS	Lowell Observatory Near-Earth-Object Search
2232	LOOGY	Lefty One-Out GuY,a sometimes pejorative nickname for the left-handed specialist in baseball
2233	LORTID	LOng Range Target IDentification
2234	LOS	Line Of Sight
2235	LOSAT	Line-Of-Sight Anti-Tank (missile)
2236	LOTA	Licentiate of the Orthodontic Technicians Association
2237	LOTIS	Livermore Optical Transient Imaging System
2238	LOTS	Logistics Over-The-Shore
2239	LP	Linkin Park,Linkup Point,Listening Post,Long Playing record,Louisiana Pacific (cf. LP Field)
2240	LPC	Linear Predictive Coding
2241	LPD	Landing Platform Dock (Navy hull classification),Low Probability of Detection
2242	LPG	Liquefied Petroleum Gas (cf. LNG)
2243	LPI	Low Probability of Intercept
2244	LPS	Landsat Processing System,LipoPolySaccharide
2245	Lr	Lawrencium
2246	LR	Liberia (ISO 3166 digram)
2247	LRC	Logistics iness Center
2248	LRGW	Long-Range Guided Weapon
2249	LRICBM	Limited Range ICBM
2250	LRIP	Low Rate Initial Production
2251	LRP	Logistics Release Point
2252	LRPE	Long-Range Planning Element
2253	LRS	Long Range Surveillance
2254	LRU	Line-Replaceable Unit
2255	LSAT	Law School Admission Test (often pronounced as 'el-SAT')
2256	LSI	Large-Scale Integration
2257	LSIF	Labour Sponsored Investment Fund
2258	LSND	Liquid Scintillator Neutrino Detector
2259	LSO	Lesotho (ISO 3166 trigram)
2260	LSST	Large Synoptic Survey Telescope
2261	LST	Landing Ship,Tank (World War II; also known,not entirely affectionately,as 'Large Slow Target')
2262	LSVW	Light Support Vehicle,Wheeled
2263	LT	Lithuania (ISO 3166 digram)
2264	Lt	Lieutenant
2265	LtC	Lieutenant-Colonel (U.S.)
2266	LTC	Long-Term Costing
2267	Ltd	Limited
2268	LTDP	Long-Term Defence Plan
2269	LTG	Lieutenant General,Lightning (METAR Code)
2270	LTI	Linear Time-Invariant
2271	LTM	Acronym for Laughing To Myself
2272	LTP	Long-Term Potentiation
2273	LTU	Lithuania (ISO 3166 trigram)
2274	LU	Acronym Love You
2275	LU	Loonatics Unleashed
2276	Lu	Lutetium
2277	LUCA	Last Universal Common Ancestor
2278	LUG	Linux User Group
2279	LULU	Locally Unwanted Land Use (urbanism)
2280	LUT	Limited User Test (ing),Local User Terminal
2281	LUVW	Light Utility Vehicle,Wheeled
2282	LUX	Luxembourg (ISO 3166 trigram)
2283	LV	Las Vegas,Latvia (ISO 3166 digram),Launch Vehicle,Leading Vehicle,Leave,Left Ventricle,Level Valve,Linking Verb,Liverpool Victoria
2284	LVA	Latvia (ISO 3166 trigram)
2285	LVAD	Left Ventricular Assist Device,Low-Velocity Airdrop
2286	LVEF	Left Ventricular Ejection Fraction
2287	LW	Land Warrior,Low Water (nautical charts)
2288	Lw	Lawrencium (obsolete 1963)
2289	LWR	Laser warning receiver
2290	LWRC	Land Warfare Resources Corporation
2291	LWS	Land Warrior System
2292	LX	Electrics (theatrical term)
2293	LX	Luxembourg (amateur radio ITU prefix),Swiss International Air Lines (IATA code)
2294	LY	Libya (ISO 3166 digram),Lithuania (amateur radio ITU prefix)
2295	LYAO	Laugh Your Ass Off
2296	LYLAS	Love You Like A Sister
2297	LZ	Bulgaria (amateur radio ITU prefix),Landing Zone
2298	M	Mega-,One thousand (in Roman numerals)
2299	m	Metre,Milli
2300	MA	Marijuana Anonymous,Master of Arts,Massachusetts (postal symbol),Megaampere,Morocco (ISO 3166 digram)
2301	Ma	Megaannum
2302	mA	Milliampere
2303	MAA	Mathematical Association of America
2304	MAAC	Metro Atlantic Athletic Conference
2305	MACE	Multi-Agent Computing Environment
2306	MACHO	MAssive Compact Halo Object
2307	MADD	Mothers Against Drunk Driving,MyoAdenylate Deaminase Deficiency,Multiply-Add
2308	MAF	Maintenance Action Form
2309	MAGIC	Major Atmospheric Gamma-ray Imaging Cherenkov (telescope)
2310	MAGNETAR	Metaprogrammable AGent NETwork ARchitecture
2311	MAGTF	Marine Air-Ground Task Force
2312	Mahasz	Magyar Hanglemezkiadók Szövetsége (Hungarian for: 'Association of Hungarian Record Companies')
2313	MALD	Miniature Air-Launched Decoy
2314	MANPADS	MAN-Portable Air Defence System
2315	MANPRINT	MANpower and PeRsonnel INTegration
2316	MAO	Molėtų astronomijos observatorija (Moletai Astronomical Observatory),MonoAmine Oxidase
2317	MAOI	Monoamine oxidase inhibitor
2318	MAPS	Monitoring Avian Productivity and Survivorship
2319	MAR	Morocco (ISO 3166 trigram)
2320	MarBEF	Marine Biodiversity and Ecosystem Functioning
2321	MARCENT	United States Marine Forces Central Command
2322	MARFORCC	Marine Force Component Commander
2323	MASAS	Monte Agliale Supernovae and Asteroid Survey
2324	Maser	Microwave Amplification by Stimulated Emission of Radiation
2325	MASH	Mobile Army Surgical Hospital
2326	MASINT	Measurement And Signature Intelligence
2327	MAVS	Mobile Artillery Vehicle System
2328	MB	Manitoba (postal symbol),Medal of Bravery (Canada)
2329	MBA	Main Battle Area,Main Belt Asteroid,Masters of Business Administration
2330	MBBL	(U.S. Armor Center) Mounted Battlespace Battle Laboratory
2331	MBCC	Migratory Bird Conservation Commission (U.S.)
2332	MBCS	Multi-Byte Character Set
2333	MBI	Moody Bible Institute
2334	MBIDST	Member of the British Institute of Dental and Surgical Technologists
2335	MBM	Meat and Bone Meal
2336	MBT	Main Battle Tank
2337	MBTI	Myers-Briggs Type Indicator
2338	mC	Millicoulomb
2339	MCDL	Model Composition Definition Language
2340	MCFT	Modified Compression Field Theory
2341	MCG	Melbourne Cricket Ground
2342	MCIS	Mellon Collie and the Infinite Sadness
2343	MCM	Mine Counter-Measures
2344	MCMV	Mine Counter-Measure Vessel
2345	MCR	My Chemical Romance
2346	MCSF	Marine Corps Security Forces
2347	MCT	Movement Control Team
2348	MCTIS	Mounted Co-operative Target Identification System
2349	Md	Mendelevium
2350	MDNA	Madonna's 12th studio album title (2012)
2351	MDO	Membership Driven Organisation
2352	MDP	Markov Decision Process
2353	MDT	Mountain Daylight Time (UTC-6 hours)
2354	MDV	Maldives (ISO 3166 trigram)
2355	Me	Messerschmitt
2356	MEAC	Mid-Eastern Athletic Conference (ME-ac)
2357	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)
2358	MEDEVAC	Medical evacuation
2359	MEDS	Mission Essential Data Set
2360	MEG	MagnetoEncephaloGraphy
2361	MELT	Metallic Line/Loop Test (ing)
2362	MEMS	Microelectromechanical System
2363	MER	Mars Exploration Rover
2364	MERL	Mitsubishi Electric Research Laboratories
2365	MES	Manufacturing Execution Systems
2366	METAR	[Meteorological] Aviation Routine weather report
2367	METOC	Meteorological and Oceanographic
2368	MeV	Megaelectronvolt
2369	MEX	Mexico (ISO 3166 trigram)
2370	MEZ	Missile Engagement Zone
2371	MF	Megafarad
2372	mF	Millifarad
2373	MG	Machine Gun,Madagascar (ISO 3166 digram),Major General,Morris Garage
2374	MGPAM	My Gym Partner's a Monkey
2375	MGS	Mobile Gun System
2376	mH	Millihenry
2377	MHC	Major Histocompatibility Complex
2378	MHHW	Mean Higher High Water (nautical charts)
2379	MHL	Marshall Islands (ISO 3166 trigram)
2380	MHLW	Mean Higher Low Water (nautical charts)
2381	MHRA	(UK) Medicines and Healthcare products Regulatory Agency
2382	MHW	Mean High Water (nautical charts)
2383	MHWN	Mean High Water Neaps (nautical charts)
2384	MHWS	Mean High Water Springs (nautical charts)
2385	MHz	Megahertz
2386	Mi	Mebi
2387	MIA	Missing In Action
2388	MICLIC	Mine Clearing Line Charge
2389	MICOM	Missile Command
2390	MID	Midway Islands (ISO 3166 trigram; obsolete 1986)
2391	MIDAS	Man-machine Integration Design and Analysis System
2392	MIDI	Musical Instrument Digital Interface
2393	MIDS	Multi-Function Information Distribution System
2394	MIFG	Shallow Fog (METAR Code)
2395	MIKE	Monitoring of Illegal Killing of Elephants
2396	MIL	Man-In-the-Loop
2397	MILC	Mirrorless interchangeable-lens camera
2398	MILF	Mother I'd Like to Fuck
2399	MIMOSA	MIcroMeasurements Of Satellite Acceleration
2400	MIMPT	Member of the Institute of Maxillofacial Prosthetists and Technologists
2401	MIRA	MILAN Infra-Red Acquisition (thermal sight)
2402	MIRV	Multiple Independent Reentry Vehicle
2403	MISREP	Mission Report
2404	MISSI	Multilevel Information System Security Initiative
2405	MITL	Man-In-The-Loop
2406	MITS	see entry
2407	mJ	Millijoule
2408	MJD	Modified Julian Day
2409	mK	Millikelvin
2410	MKG	Michael Kidd-Gilchrist (American basketball player)
2411	MKSA	Metre-Kilogram-Second-Ampere (system of units)
2412	mL	Millilitre
2413	MLB	Major League Baseball
2414	MLC	Member of the Legislative Council (in India)
2415	MLE	Maximum likelihood estimation
2416	MLHW	Mean Lower High Water (nautical charts)
2417	MLI	Mali (ISO 3166 trigram)
2418	MLL	Major League Lacrosse
2419	MLLW	Mean Lower Low Water (nautical charts)
2420	MLP	My Little Pony
2421	MLRS	Multiple-Launch Rocket System
2422	MLT	Malta (ISO 3166 trigram)
2423	MLW	Mean Low Water (nautical charts)
2424	MLWN	Mean Low Water Neaps (nautical charts)
2425	MLWS	Mean Low Water Springs (nautical charts)
2426	Mm	Megametre
2427	mm	Millimetre
2428	MMEV	Multi-Mission Effects Vehicle
2429	MMI	Magical MonkeyZ Inc.
2430	MMI	Man-Machine Interface
2431	MMI	McLean Meditation Institute
2432	MMIC	McLean Meditation Institute Certified
2433	MMO	Massively Multiplayer Online (computer game)
2434	MMOR	Master of Management in Operations Research
2435	MMORPG	Massively multiplayer online role-playing game
2436	MMPR	Mighty Morphin Power Rangers
2437	MMS	Multimission Modular Spacecraft
2438	Mn	Manganese
2439	mN	Millinewton
2440	MNB	Multinational Brigade
2441	MNE	Montenegro (ISO 3166 trigram)
2442	MNMF	Multi-National Maritime Force
2443	MNP	Northern Mariana Islands (ISO 3166 trigram)
2444	MNS	Mission Needs Statement
2445	Mo	Molybdenum
2446	MOA	Museum of Art (Brigham Young University)
2447	MOCAS	Mechanization Of Contract Administration Services
2448	MoD	Ministry of Defence (United Kingdom) and various other countries
2449	modem	Modulator-Demodulator
2450	Moe	Marvel of entertainment
2451	MOE	Measure Of Effectiveness
2452	MOF	Ministry of Finance (Japan)
2453	MOFA	Ministry of Foreign Affairs (Japan)
2454	MOID	Minimum Orbital Intersection Distance
2455	MOJWA	Movement for Oneness and Jihad in West Africa
2456	MOLO	Mobile Other Licensed Operator (UK)
2457	MOM	Master's Degree in Oriental medicine
2458	MOM	Message Oriented Middleware
2459	MoM	Multiple of the median
2460	MoMA	Museum of Modern Art (NYC)
2461	MOND	Modified Newtonian Dynamics
2462	MOO	Measure Of Outcome
2463	MOPP	Mission-Oriented Protective Posture
2464	MORP	Meteorite Observation and Recovery Project
2465	MOSFET	Metal-Oxide-Semiconductor Field-Effect Transistor
2466	MOT	Ministry of Transport (UK)
2467	MOTA	Member of the Orthodontic Technicians Association
2468	MOTESS	Moving Object and Transient Event Search System
2469	MOU	Memorandum Of Understanding
2470	MOW	Maintenance of way (also MW)
2471	MOZ	Mozambique (ISO 3166 trigram)
2472	MPa	Megapascal
2473	mPa	Millipascal
2474	MPAA	Motion Picture Association of America
2475	MPEC	Minor Planet Electronic Circular
2476	MPEG	Motion Pictures (Coding) Experts Group
2477	MPEV	Multi-Purpose Engineering Vehicle
2478	MPF	Maritime Prepositioning Force
2479	MPFC	Medial PreFrontal Cortex
2480	MPG	Miles Per Gallon
2481	MPMC	Medial PreMotor Cortex
2482	MPSI	Member of the Pharmaceutical Society of Ireland
2483	MPSoC	MultiProcessor System-on-Chip
2484	MPSRON	Maritime Propositioning Ship Squadron
2485	MR	Mauritania (ISO 3166 digram)
2486	MRAV	Multi-Role Armoured Vehicle
2487	MRBM	Medium Range Ballistic Missile
2488	MRC	Maintenance Requirements Card
2489	MRD	Motorized Rifle Division
2490	MRGW	Medium-Range Guided Weapon
2491	MRI	Magnetic Resonance Imaging
2492	MRL	Multiple Rocket Launcher
2493	MRPharmS	Member of the Royal Pharmaceutical Society (Great Britain)
2494	MRS	Magnetic Resonance Spectroscopy
2495	MRSA	Methicillin-resistant Staphylococcus aureus
2496	MRTFB	U.S. Major Range and Test Facility Base
2497	Ms	Megasecond
2498	mS	Millisiemens
2499	MSD	Minimum Safe Distance
2500	MSDB	Multi Source Data Base
2501	MSE	Multiple Subscriber Element
2502	MSG	Message
2503	MSLP	Mean Sea Level Pressure
2504	MSNBC	Microsoft National Broadcasting Company Cable news channel (see also msnbc.com)
2505	MSO	Multiple System Operator
2506	MSPB	Merit Systems Protection Board
2507	MSSA	Methicillin-susceptible Staphylococcus aureus
2508	Mt	Meitnerium
2509	mT	Millitesla
2510	MTBF	Mean Time Between Failures
2511	MtF	Male-to-female transsexual
2512	MTG	Magic: The Gathering
2513	MTQ	Martinique (ISO 3166 trigram)
2514	MTT	Methylthiazol tetrazolium (assay)
2515	MTTF	Mean Time To Failure
2516	MTTR	Mean Time To Recover
2517	MTWS	MAGTF Tactical Warfare System
2518	MUS	Mauritius (ISO 3166 trigram)
2519	mV	Millivolt
2520	MVC	Missouri Valley Conference
2521	MVFC	Missouri Valley Football Conference
2522	MVNO	Mobile virtual network operator
2523	mW	Milliwatt
2524	MWESH	Machismo Wizards Extended SHelter (operating system)
2525	MWI	Malawi (ISO 3166 trigram)
2526	MWOA	Mount Wilson Observatory Association
2527	MWTB	Mounted Warfare Test Bed
2528	MY	Malaysia (ISO 3166 digram)
2529	MYOB	Mind Your Own Business
2530	MYS	Malaysia (ISO 3166 trigram)
2531	MYT	Mayotte (ISO 3166 trigram)
2532	n	Nano
2533	N/A	Not Available, Not Applicable, or: No Answer
2534	N3F	National Fantasy Fan Federation
2535	nA	Nanoampere
2536	Na	Sodium (Latin Natrium)
2537	NAA	N-Acetylaspartate
2538	NAAD	North American Air Defense
2539	NAAQS	National Ambient Air Quality Standards
2540	NAAWS	NATO Anti-Air Warfare System
2541	NAC	National Agency Check,U.S. Naval Avionics Center,U.S. Navy Advanced Concepts,North Atlantic Council,Northern Area Command
2542	NACC	North Atlantic Cooperation Council
2543	NACISA	NATO Communications and Information Systems Agency
2544	NACMA	NATO Air Command and Control System Management Agency
2545	NACRA	North America Caribbean Rugby Association (more specifically rugby union)
2546	NAEC	U.S. Naval Air Engineering Center
2547	NAFERA	Native American Free Exercise of Religion Act
2548	NAFLD	NonAlcoholic Fatty Liver Disease
2549	NAFO	Northwest Atlantic Fisheries Organization
2550	NAFTA	North American Free Trade Agreement
2551	NAGPRA	Native American Graves Protection and Repatriation Act
2552	NAICS	North American Industry Classification System
2553	NAIL	Neurotics Anonymous
2554	NAILS	National Airspace Integrated Logistics System
2555	NAIRU	Non Accelerating Inflation Rate of Unemployment
2556	NAK	Negative Acknowledge
2557	NAM	Namibia (ISO 3166 trigram)
2558	NAMBLA	North American Man-Boy Love Association
2559	NAMRL	Naval Aerospace Medical Research Laboratory
2560	NaN	Not A Number (computing)
2561	NAO	UK National Audit Office
2562	NAPS	Navy Acquisition Procedures Supplement
2563	NARA	(U.S.) National Archives and Records Administration
2564	NARAL	National Abortion Rights Action League
2565	NARDAC	Naval Regional Data Automation Center
2566	NARDIC	U.S. Navy Acquisition Research and Development Information Center
2567	NARPV	National Association for Remotely Piloted Vehicles
2568	NASCAR	National Association for Stock Car Auto Racing
2569	NASDAQ	National Association of Securities Dealers Automated Quotations
2570	NASED	National Association of State Election Directors [1][2]
2571	NASH	Non-Alcoholic Steatohepatitis
2572	NASP	National Aerospace Plane
2573	NASS	National Association of Secretaries of State [3]
2574	NatGeo	National Geographic
2575	NaUKMA	National University of Kyiv-Mohyla Academy
2576	NAV	Navigation[al]
2577	NAVCAMS	Naval Communications Area Master Station
2578	NAVCC	National Audio-Visual Conservation Center
2579	NAVCENT	Naval Forces U.S. Central Command
2580	NAVDAC	Naval Data Automation Command
2581	NAVEUR	Naval Forces U.S. European Command
2582	NAVFOR	Naval Force
2583	NAVMACS	Naval Modular Automatic Communication Subsystem
2584	NAVNET	Navy Network
2585	NAVS	Non-Cooperative Airborne Vector Scoring
2586	NAVSAT	Navigation Satellite
2587	NAVSPACECOM	U.S. Navy Space Command
2588	NAVSPASUR	U.S. Naval Space Surveillance System
2589	NAVSTAR	Navigation Satellite Timing And Ranging
2590	NAVTACNET	Navy Tactical Network
2591	NAWC	U.S. Naval Air Warfare Center
2592	Nb	Niobium
2593	NBA	National Basketball Association
2594	NBL	National Basketball League (Australia)
2595	NBT	Nitroblue tetrazolium (assay)
2596	nC	Nanocoulomb
2597	NCA	National Command Authority
2598	NCAR	U.S. National Center for Atmospheric Research
2599	NCB	National Codification Bureau
2600	NCCAM	U.S. National Center for Complementary and Alternative Medicine
2601	NCCUSL	National Conference of Commissioners on Uniform State Laws (U.S.)
2602	NCDDR	U.S. National Center for the Dissemination of Disability Research
2603	NCI	U.S. National Cancer Institute
2604	NCL	New Caledonia (ISO 3166 trigram)
2605	NCLR	National Council of La Raza
2606	NCMO	No Commitment Make Out
2607	NCO	Non-Commissioned Officer
2608	NCP	Net Contracted Purchases
2609	NCR	National Cash Register Co.
2610	NCTR	Non-Co-operative Target Recognition
2611	NCW	Network Centric Warfare
2612	Nd	Neodymium
2613	NDAA	U.S. National Defense Authorization Act
2614	NDBP	Non-Departmental Public Body (Scotland)
2615	NDP	New Democratic Party (Canada)
2616	NDS	Nintendo DS
2617	Ne	Neon
2618	NECTEC	National Electronics and Computer Technology Center (Thailand)
2619	NEMS	National Energy Modeling System (USDOE-EIA)
2620	NEPA	National Environmental Policy Act
2621	NER	Niger (ISO 3166 trigram)
2622	NERICA	New Rice for Africa
2623	NESP	NSA/CSS Enterprise Standards Program
2624	NET	National Educational Television
2625	NETCU	(UK) National Extremism Tactical Co-ordination Unit
2626	NETL	(US) National Energy Technology Laboratory
2627	NETWARS	Network Warfare Simulation
2628	NEX	Navy EXchange
2629	nF	Nanofarad
2630	NF	Norfolk Island (ISO 3166 digram)
2631	NFER	National Foundation for Educational Research
2632	NFG	No Fucking Good
2633	NFHS	National Federation of State High School Associations
2634	NFI	Not F****** Interested
2635	NFK	Norfolk Island (ISO 3166 trigram)
2636	Nfld	Newfoundland
2637	NFPA	National Fluid Power Association (United States)
2638	NFT	No Further Text
2639	NGA	U.S. National Geospatial-Intelligence Agency, Nigeria (ISO 3166 trigram)
2640	NGATS	New Generation Army Targetry System
2641	NGH	Northern General Hospital
2642	NGO	non-governmental organization
2643	NGS	Naval Gunfire Support
2644	nH	Nanohenry
2645	NHANES	National Health and Nutrition Examination Survey
2646	NHB	New Hebrides (ISO 3166 trigram; obsolete 1980)
2647	NHB	No Holds Barred radio (Link)
2648	NHL	National Hockey League
2649	NHRA	National Hot Rod Association
2650	NHS	National Health Service (UK)
2651	Ni	Nickel
2652	NIAAA	U.S. National Institute on Alcohol Abuse and Alcoholism
2653	NIAG	NATO Industrial Advisory Group
2654	NIAID	National Institute of Allergies and Infectious Disease
2655	NIAMD	National Institute of Arthritis and Musculoskeletal Diseases
2656	NIB	New In Box (Internet auction/trading listings)
2657	NIBP	Non-invasive blood pressure monitor
2658	NicA	Nicotine Anonymous
2659	NICAP	National Investigations Committee on Aerial Phenomena
2660	NICE	UK. National Institute for Health and Clinical Excellence
2661	NICHD	National Institute of Child Health and Human Development [4]
2662	NICP	National Inventory Control Point
2663	NIDDK	National Institute of Diabetes and Digestive and Kidney Diseases
2664	NIDRR	National Institute on Disability Research and Rehabilitation
2665	NIEHS	National Institute of Environmental Health Sciences
2666	NIIN	National Item Identification Number
2667	NIMA	National Imagery and Mapping Agency (became NGA)
2668	NIMBY	Not In My Back Yard (See NOME)
2669	NIMG	Not In My Generation
2670	NIN	Nine Inch Nails (band)
2671	NIPR	National Institute of Polar Research (Japan)
2672	NIR	Northern Ireland (FIFA trigram; not eligible for an ISO 3166 or IOC trigram)
2673	NISAC	U.S. National Infrastructure Simulation and Analysis Center
2674	NISCAP	NSA Information System Certification and Accreditation Program
2675	NISER	National Institute of Science Education and Research
2676	NIST	National Institute of Standards and Technology
2677	NITFS	National Imagery Transmission Format Standard
2678	NIU	Niue (ISO 3166 trigram)
2679	nJ	Nanojoule
2680	NJ	New Jersey (postal symbol)
2681	NJHS	National Junior Honor Society
2682	NJPW	New Japan Pro Wrestling
2683	nK	Nanokelvin
2684	NKA	No Known Allergies
2685	nL	Nanolitre
2686	NLB	Non-Linear Battlefield
2687	NLD	Netherlands (ISO 3166 trigram)
2688	NLF	National Liberation Front (disambiguation)
2689	NLL	National Lacrosse League
2690	NLP	Natural Language Processing,Neuro-Linguistic Programming (pseudoscience)
2691	NLRB	National Labor Relations Board
2692	NLW	Non-Lethal Weapon
2693	nm	Nanometre
2694	NM	New Mexico (postal symbol)
2695	NMCI	Navy Marine Corps Intranet
2696	NMCS	Not Mission Capable Supply (SM&R code)
2697	NMD	U.S. National Missile Defense
2698	NMHNFG	Not Made Here,No Fucking Good
2699	NMN	No middle name
2700	NMR	Nuclear Magnetic Resonance
2701	NMSG	NATO Modelling and Simulation Group
2702	nN	Nanonewton
2703	NNE	North North-East
2704	NNSA	U.S. National Nuclear Security Administration
2705	NNW	North North-West
2706	NO	Nitric Oxide,Normally Open,Norway (ISO 3166 and FIPS 10-4 country code digram)
2707	No	Nobelium
2708	NOAA	U.S. National Oceanic and Atmospheric Administration
2709	NOAF	Norwegian Air Force
2710	NOAO	National Optical Astronomy Observatory
2711	NOC	UK. National Oceanography Centre
2712	NODEF	NATO Oceanographic Data Exchange Format
2713	NOGI	New Orleans Grande Isle (award for diving)
2714	NOLA	New Orleans,Louisiana (LA is the official postal code for Louisiana)
2715	NOLF	Navy OutLying Field
2716	NoMBO	Non-mine,Mine-like Bottom Object
2717	NOME	Not on Mars Either
2718	NOME	Not on Mars Either (see NIMBY)
2719	NOPA	National Office Products Alliance,National Office Products Association
2720	NOR	Norway (ISO 3166 trigram)
2721	NORELPREF	No religious preference
2722	NORTHAG	Northern Army Group
2723	NOS	Network Operating System,New Old Stock (Internet auction/trading listings),Nitric Oxide Synthase (enzyme)
2724	NOSA	NATO OSI Security Architecture
2725	NOTAFLOF	No One Turned Away For Lack Of Funds
2726	NOW	National Organization for Women
2727	NP	National Permit,A permit in India for trucks so they can go anywhere in the nation
2728	Np	Neap tide (nautical charts),Neptunium
2729	NP	Nepal (ISO 3166 and FIPS 10-4 country code digram)
2730	NPB	Nippon Professional Baseball
2731	NPC	National Postgraduate Committee,National Provincial Championship (New Zealand rugby competition,now defunct),Navigation Planning Chart
2732	NPCS	Non-Passenger Coaching stock (in Railways)
2733	NPD	Nationaldemokratische Partei Deutschlands (German)
2734	NPDI	New Product Development and Introduction
2735	NPG	Needline/Network Participation Group
2736	NPH	Normal Pressure Hydrocephalus
2737	NPL	National Priorities List,Nepal (ISO 3166 trigram)
2738	NPO	nothing by mouth
2739	NPOV	Neutral Point Of View
2740	NQ	Dronning Maud Land (ISO 3166 digram; obsolete 1983)
2741	NQOCD	Not Quite Our Class,Dear (or Darling). (Upper-class English slang)
2742	NR	Nauru (ISO 3166 and FIPS 10-4 country code digram)
2743	NRA	National Rifle Association
2744	NRAO	National Radio Astronomy Observatory
2745	NRC	(U.S.) National Research Council,Nuclear Regulatory Commission (U.S.)
2746	NRDC	(U.S.) Natural Resources Defense Council
2747	NREL	(U.S.) National Renewable Energy Laboratory
2748	NRK	Norsk Rikskringkasting (Norwegian Broadcasting Corporation)
2749	NRMP	National Resident Matching Program (U.S. medicine)
2750	NRO	(U.S.) National Reconnaissance Office
2751	NRT	Near Real Time
2752	NRTA	National Rat Terrier Association,National Retail Tenants Association,National Retired Teachers Association,Northwest Regional Transmission Association
2753	NRU	Nauru (ISO 3166 trigram)
2754	ns	Nanosecond
2755	nS	Nanosiemens
2756	NS	Norfolk Southern Railway (AAR reporting mark),Nova Scotia (postal symbol),Suriname (FIPS 10-4 country code)
2757	NSA	U.S. National Security Agency,Naval Support Activity,No Strings Attached
2758	NSABB	National Science Advisory Board for Biosecurity
2759	NSAID	Non-Steroidal Anti-Inflammatory Drug
2760	NSB	Norges Statsbaner (Norwegian State Railways)
2761	NSC	National Security Council
2762	NSDAP	Nationalsozialistische Deutsche Arbeiterpartei (German: 'German National Socialist Workers Party',the formal name of the Nazi Party)
2763	NSDL	National Science Digital Library (US)
2764	NSG	National System for Geospatial-Intelligence
2765	NSN	National Stock Number
2766	NSNA	National Student Nurses' Association
2767	NSO	National Standardization Office (ABCA)
2768	NSS	(U.S.) Naval Simulation System
2769	NST	(UK) Nimrod Software Team
2770	NSTAC	National Security Telecommunications Advisory Committee
2771	NSV	Nikitin-Sokolov-Volkov heavy machine gun (Russian НСВ Никитина-Соколова-Волкова) ru:ПулеметНСВ-12,7 'Утес'
2772	NSW	New South Wales (postal symbol)
2773	nT	Nanotesla
2774	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)
2775	NTC	National Training Center,Negative Temperature Coefficient (thermistor)
2776	NTDS	Naval Tactical Data System
2777	NTP	Network Time Protocol
2778	NTR	Network Time Reference
2779	NTRA	National Thoroughbred Racing Association
2780	NTSB	National Transportation Safety Board
2781	NTSC	National Television Standards Committee (colloquially,Never Twice the Same Color)
2782	NTV	Non-Tactical Vehicle
2783	NTY	(Internet Abbreviations:) Not Tested Yet; (Alternatively) No Thank You
2784	NTZ	Iraq-Saudi Arabia Neutral Zone (ISO 3166 trigram; obsolete 1993)
2785	NU	Nicaragua (FIPS 10-4 country code),Niue (ISO 3166 digram),Nunavut (postal symbol)
2786	NUL	Null character (ASCII code of control character),National Urban League
2787	NUTS	Nuclear Utilization Target Selection
2788	NUWC	U.S. Naval Undersea Warfare Center
2789	nV	Nanovolt
2790	NVEOL	Night Vision and Electro-Optics Laboratory
2791	NVESD	CERDEC Night Vision and Electronic Sensors Directorate,Fort Belvoir,Virginia
2792	NVG	Night Vision Goggles
2793	NVL	Night Vision Laboratory
2794	nW	Nanowatt
2795	NW	North-West
2796	NW	Nuclear Weapon
2797	NWA	National Wrestling Alliance
2798	NWF	National Wildlife Federation
2799	NWFZ	Nuclear-Weapon-Free Zone
2800	NWHN	U.S. National Women's Health Network
2801	nWo	New World Order (see article for explanation of idiosyncratic capitalization)
2802	NWOAHM	New Wave of American Heavy Metal
2803	NWOBHM	New Wave of British Heavy Metal (sometimes pronounced /n.ˈwɒbm/ as if it were an acronym)
2804	NWRA	National Wildlife Rehabilitators Association
2805	NWSL	National Women's Soccer League (U.S.)
2806	NWT	North-West Territories
2807	NXA	21st arcade game in the Pump It Up series
2808	NXD	Native XML
2809	NXE	New Xbox Experience
2810	NXG	New Cross Gate station
2811	NXL	National XBall League
2812	NXN	Nike Cross Nationals
2813	NY	New York (postal symbol)
2814	NYC	New York City
2815	NYT	New York Times
2816	NYHA	New York Heart Association
2817	NYO	National Youth Orchestra of Great Britain
2818	NYSE	New York Stock Exchange
2819	NZ	New Zealand (ISO 3166 and FIPS 10-4 country code digram)
2820	NZC	New Zealand Cricket
2821	NZL	New Zealand (ISO 3166 trigram)
2822	NzL	Noze looan (online/event listings)
2823	NZOSS	New Zealand Open Source Society
2824	NZRU	New Zealand Rugby Union
2825	OAC	On Approved Credit
2826	OAP	Old Age Pensioner (UK)
2827	OARSI	Osteoarthritis Research Society International
2828	OAS	Organization of American States
2829	OASIS	Ontario Agencies Supporting Individuals with Special Needs
2830	OASIS	Ontario Association of Sewage Industry Services
2831	OASP	Operational Analysis Support Paper/Plan
2832	OAU	Organization for African Unity
2833	OBE	Officer of the Order of the British Empire
2834	OBX	Outer Banks (North Carolina)
2835	OC	Officer Commanding
2836	OCD	Obsessive-Compulsive Disorder
2837	OCFS	Oracle Cluster File System
2838	OCFS2	Oracle Cluster File System Release 2
2839	OCMCC	[2] Orchard County MCC
2840	OCN	Oncology Certified Nurse
2841	OCO	Oort Cloud Object
2842	OCR	Optical Character Recognition
2843	OCS	see entry
2844	ODAS	OCA-DLR Asteroid Survey
2845	ODBC	Open DataBase Connectivity
2846	OEA	(U.S.) Office of Economic Adjustment
2847	OECD	Organisation for Economic Co-operation and Development (international)
2848	OED	Oxford English Dictionary
2849	OEG	Operation Exposure Guidance
2850	OEIS	On-Line Encyclopedia of Integer Sequences
2851	OEM	Original Equipment Manufacturer
2852	OFA	Occipital Face Area
2853	OFDA	U.S Agency for International Development's Office of Foreign Disaster Assistance
2854	OGC	Open Geospatial Consortium
2855	OGD	Other Government Department
2856	OGO	Other Government Organization
2857	OH	Ohio (postal symbol)
2858	OHC	OverHead-Cam engine
2859	OHHLA	Original Hip-Hop Lyrics Archive
2860	OHIP	Ontario Health Insurance Plan
2861	OHMS	On Her (or His) Majesty's Service (also written: O.H.M.S.)
2862	OHP	Observatoire de Haute-Provence
2863	OHSS	Ovarian Hyperstimulation Syndrome
2864	OIC	Officer In Charge
2865	OIF	Operation Iraqi Freedom
2866	OIOC	Oriental & India Office Collections (in the British Library)
2867	OJT	On-the-Job Training
2868	OKC	Oklahoma City
2869	OLED	Organic Light-Emitting Diode
2870	OLS	Operational Linescan System
2871	OMD	Orchestral Manoeuvres in the Dark (1980s pop group)
2872	OME	Osaka Mercantile Exchange
2873	OMFG	Oh My Fucking God
2874	OMG	Oh My God or Or My Gosh
2875	OMGW	Oh My Gosh it's Windy
2876	OMN	Oman (ISO 3166 trigram)
2877	OMNCS	U.S. Office of the Manager for the National Communications System
2878	OMP	Order of Mapungubwe in Platinum
2879	OMS	Order of Mapungubwe in Silver
2880	OMT	Object Model Template
2881	ON	Ontario (postal symbol)
2882	ONC	Orthopaedic Nurse Certified
2883	ONG	Orthodontic National Group
2884	ONI	(U.S.) Office of Naval Intelligence
2885	ONS	Operational Needs Statement
2886	OOAD	Object Oriented Analysis and Design
2887	OOBE	Out-of-body experience
2888	OOCL	Orient Overseas Container Line
2889	OODA	Observation,Orientation,Decision,Action loop (a.k.a. Boyd's Loop)
2890	OOF	Out of Facility
2891	OOMF	One Of My Followers
2892	OOO	Out Of the Office
2893	OOTW	Operations Other Than War
2894	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
2895	OPAC	Online Public Access Catalogue
2896	OPCON	Operational control
2897	OPCW	Organisation for the Prohibition of Chemical Weapons
2898	OPEC	Organization of the Petroleum Exporting Countries
2899	OPFOR	Opposing force
2900	OPINTEL	Operational Intelligence
2901	OPLAN	Operation plan (also OpPlan)
2902	OPORD	Operation order
2903	OPSEC	Operations security,Open Platform for Security
2904	OPSI	Overwhelming post splenectomy infection,UK Office of Public Sector Information
2905	OPTAR	Operational target
2906	OPV	Offshore Patrol Vessel
2907	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)
2908	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
2909	ORAU	Oak Ridge Associated Universities
2910	ORB	Object Request Broker
2911	ORBAT	Order of Battle
2912	ORD	Office of Research and Development,Operational Requirements Document
2913	ORF	Operational iness Float
2914	ORISE	Oak Ridge Institute for Science and Education
2915	ORNL	Oak Ridge National Laboratory
2916	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
2917	ORSA	Oxacillin-resistant Staphylococcus aureus,Operations Research Society of America
2918	OS	Operating System
2919	Os	Osmium
2920	OSA	Order of St. Augustine
2921	OSCE	Organisation for Security and Cooperation in Europe
2922	OSD	U.S. Office of the Secretary of Defense,On-screen Display
2923	OSDL	Open Source Development Labs
2924	OSE	Own Separate Entrance
2925	OSERS	U.S. Department of Education Office of Special Education and Rehabilitative Services
2926	OSETI	Optical SETI also Optical SETI
2927	OSHA	Occupational Safety and Health Administration
2928	OSI	Office of Strategic Influence,Ontario Swine Improvement,Open Source Initiative,Open Systems Interconnection
2929	OSIA	(U.S.) On-Site Inspection Agency
2930	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)
2931	OSL	Open Source License, Optically Stimulated Luminescence, Orbiting Solar Laboratory
2932	OSM	One Saturday Morning
2933	OSOTPBOIAS	One Sec,On The Phone,Be Off In A Sec
2934	OSPA	Operations Security Professional's Association site of OSPA
2935	OSPA	Oregon School Psychologists Association [3]
2936	OSRH	Oružane Snage Republike Hrvatske (en: Armed forces of the Republic of Croatia)
2937	OSS	Office of Strategic Services (1942-1945, forerunner of CIA)
2938	OSU	Ohio State University,Oklahoma State University
2939	OTA	Office of Technology Assessment, Orthodontic Technicians Association
2940	OTAC	Orthodontic Technicians Association Conference,Orthodontic Technicians Association Council
2941	OTC	Over-The-Counter (drugs)
2942	OTD	Off the derech (referring to an Orthodox Jew who has stopped practicing the tenets of his or her faith)
2943	OTEA	(U.S. Army) Operational Test Evaluation Agency
2944	OTI	Office of Transition Initiatives (United States Agency for International Development)
2945	OTOH	On The Other Hand
2946	OTS	Off the scale,sexually untouchable except for a lot of money
2947	OTSBH	Over The Shoulder Boulder Holder
2948	OTW	On The Way
2949	OTYBL	Over To You Blue Leader
2950	OTYRL	Over To You Red Leader
2951	OU	University of Oklahoma
2952	OW	Old Wykehamist
2953	OWN	Oprah Winfrey Network
2954	OX	IATA code for Orient Thai Airlines
2955	OXC	Optical cross-connect
2956	OXM	Official Xbox Magazine
2957	OXT	Oxytocin
2958	OZ	(?) Australia
2959	p	pico
2960	P2P	Peer-to-peer (networking)
2961	pA	picoampere
2962	PAA	Position Area for Artillery
2963	PABX	Private Automated Branch eXchange (company phone system)
2964	PACOM	(U.S.) Pacific Command
2965	PADI	Professional Association of Diving Instructors
2966	PAEK	PolyArylEtherKetone
2967	PAFC	Plymouth Argyle Football Club
2968	PAH	Polycyclic aromatic hydrocarbon
2969	PAHO	Pan American Health Organization
2970	PAK	Pakistan (ISO 3166 trigram)
2971	PAM	Precision Attack Missile
2972	PANS	Pretty Advanced/Awesome Network Services (cf. POTS)
2973	PARC	Palo Alto Research Center
2974	PAROS	Prevention of an Arms Race in Outer Space (treaty)
2975	PARP	(NATO Partnership for Peace) Planning And Review Process
2976	PARWIG	Power Augmented Ram Wing In Ground (aeroplane wing shape)
2977	PAS	See entry
2978	PASR	Personnel Accounting and Strength Reporting
2979	PATH	Port Authority Trans-Hudson
2980	PAYD	Pay As You Drive
2981	PAYE	Pay As You Earn
2982	Pb	Lead (Latin Plumbum)
2983	PB	PolyButylene
2984	PBB	PolyBrominated Biphenyl
2985	PBCK	Problem Between Chair and Keyboard (computer help desk in-joke)
2986	PBD	PolyButaDiene
2987	PBDE	PolyBrominated Diphenyl Ether
2988	PBI	PolyBenzImidazole
2989	PBN	PolyButylene Naphthalate
2990	PBOH	Please Become Old History
2991	PBT	PolyButylene Terephthalate
2992	PBX	Private Branch eXchange (company phone system)
2993	pC	picocoulomb
2994	PCAS	Planet-Crossing Asteroid Survey
2995	PCB	see entry
2996	PCCB	Porsche Ceramic Composite Brake
2997	PCCIP	President's Commission on Critical Infrastructure Protection
2998	PCE	PerChlorEthylene
2999	PCIe	Peripheral Component Interconnect Express (computer bus)
3000	PCL	Passive Coherent Location
3001	PCMCIA	Personal Computer Memory Card International Association (People Can't Memorise Computer-Industry Acronyms)
3002	PCN	Pitcairn Islands (ISO 3166 trigram)
3003	PCPI	Physician Consortium for Performance Improvement (AMA)
3004	PCR	Polymerase chain reaction
3005	PCSSD	Pulaski County Special School District
3006	PCZ	Panama Canal Zone (ISO 3166 trigram; obsolete 1980)
3007	Pd	Palladium
3008	PD	Product Director—Example: CERDEC Product Director C4ISR and Network Modernization
3009	PDL	Pure Dumb Luck (Texan punk band)
3010	PDN	Pull-Down Network
3011	PDRY	People's Democratic Republic of Yemen (obsolete since 1990)
3012	PDT	Pacific Daylight [Saving] Time (UTC-7 hours)
3013	PE	Professional Engineer
3014	PEBCAC	Problem Exists Between Chair and Computer (IT help desk in-joke)
3015	PEBKAC	Problem Exists Between Keyboard and Chair (ditto)
3016	PEEK	PolyEtherEtherKetone
3017	PEET	Partnerships for Enhancing Expertise in Taxonomy
3018	PEK	PolyEtherKetone
3019	PEPFAR	President's Emergency Plan For AIDS Relief
3020	PER	Peru (ISO 3166 trigram)
3021	perl	usually lower case Practical Extraction and Report Language
3022	PES	PolyEtherSulfone
3023	PEST	UK Public Engagement with Science and Technology
3024	PETE	PolyEthyleneTErephthalate
3025	PETP	PolyEthyleneTerePhthalate
3026	pF	picofarad
3027	PFD	Permanent Fund Dividend = personal flotation device
3028	PFE	Permanent Forest Estate
3029	PfP	Partnership for Peace
3030	Pg	petagram
3031	pg	picogram
3032	PGCE	Postgraduate Certificate in Education
3033	PGD	Pre-implantation Genetic Diagnosis
3034	PGENI	Pharmaco-Genetics for Every Nation Initiative
3035	PGH	Pre-implantation Genetic Haplotyping
3036	PGM	Precision-Guided Munition
3037	PGP	Pretty Good Privacy
3038	PHL	Philippines (ISO 3166 trigram)
3039	PHQ	Patient Health Questionnaire
3040	Pi	Pebi
3041	PIB	PolyIsoButylene
3042	PIC	Person In Charge
3043	PICNIC	Problem In Chair Not In Computer
3044	PICS	Private Investment Capital Subscription
3045	PIF	Partners in Flight
3046	PIG	Pipeline Inspection Gauge
3047	PIN	Personal Identification Number
3048	PINF	People In Need Foundation (Czech charitable organisation)
3049	PIPA	Program on International Policy Attitudes
3050	PIR	Priority Intelligence Requirement
3051	PIRA	Provisional Irish Republican Army
3052	PIREPS	Pilot Reports
3053	PITA	Pain In The Ass
3054	PJ	petajoule
3055	pJ	picojoule
3056	PJHQ	Permanent Joint Headquarters
3057	PKE	Partnership of Kindermusik Educators [1] &[2] & [2]
3058	PKI	Public Key Infrastructure (cryptography)
3059	PKU	Phenylketonuria
3060	pL	picolitre
3061	PLAID	Precision Location and Identification
3062	PLB	Personal Locator Beacon
3063	PLC	Public Limited Company (British)
3064	PLCC	Plastic Leaded Chip Carrier (electronics)
3065	PLD	Probable Line of Deployment
3066	PLEBS	People Lacking Everyday Basic Skills
3067	PLF	Parachute Landing Fall
3068	PLIF	Planar Laser-Induced Fluorescence
3069	PLL	Phase-Locked Loop (electronics)
3070	PLM	Polarized Light Microscope/Microscopy
3071	PLMBA	Phospholipid Bilayer Microarray
3072	Pln	Platoon
3073	PLO	Palestine Liberation Organization
3074	PLOKTA	Press Lots Of Keys To Abort
3075	PLP	Platonic Life Partner
3076	PLUTO	Pipe Line Under The Ocean
3077	PLW	Palau (ISO 3166 trigram)
3078	pm	picometre
3079	PMC	Primary Motor Cortex
3080	PMI	Positive Material Identification
3081	PMID	PubMed Identifier
3082	PMMA	PolyMethylMethAcrylate
3083	PMS	Premenstrual Syndrome
3084	PMSL	Piss Myself Laughing (Internet shorthand)
3085	PMT	Premenstrual Tension (UK) (see Premenstrual Syndrome)
3086	pN	piconewton
3087	PNAC	Project for the New American Century
3088	PNVS	Pilot Night Vision Sensor
3089	Po	Polonium
3090	PO	Post Office
3091	PO	Purchase Order
3092	POCD	Post-Operative Cognitive Dysfunction
3093	pod	Plain Old Documentation
3094	POFF	Plain Old Flat File
3095	POGO	Project On Government Oversight
3096	POI	Program Of Instruction
3097	POK	Plane Of Knowledge
3098	POLAD	Political Advice
3099	POMDP	Partially observable Markov decision process
3100	PooS	Poo Sniffer (Internet shorthand)
3101	POS- Point Of Sale terminal (retail industry transaction computers)	Piece Of S**t
3102	POSH	Port Outbound Starboard Home (alleged)
3103	POSSLQ	Person of the Opposite Sex Sharing Living Quarters
3104	POT	Plane Of Tranquility
3105	POTS	Plain Old Telephone Service (cf. PANS),Postural Orthostatic Tachycardia Syndrome
3106	POTUS	President of the United States
3107	POV	Point of view
3108	POW	Prisoner of war
3109	PPASC	(U.S.) Plans and Program Analysis Support Center
3110	PPCLI	Princess Patricia's Canadian Light Infantry (regiment)
3111	PPLI	Precise Participant Location & Identification
3112	PPM	Project Planning and Management
3113	PPO	PolyPhenylene Oxide
3114	PPQN	Pulses Per Quarter Note (ditto)
3115	PPQT	Pre-Production Qualification Test
3116	PPV	Pay-per-view
3117	Pr	Pastor, Priest
3118	PR	Public Relations
3119	Prb	Presbyter
3120	PRBO	Point Reyes Bird Observatory
3121	PRC	People's Republic of China
3122	PRD	CERDEC Product Realization Directorate
3123	PRFG	Partial Fog (METAR Code)
3124	PRI	Puerto Rico (ISO 3166 trigram)
3125	PRK	Democratic People's Republic of Korea (ISO 3166 trigram)
3126	PRM	Personnel iness Management
3127	PRY	Paraguay (ISO 3166 trigram)
3128	Ps	petasecond
3129	pS	picosiemens
3130	PSG	Pacific Seabird Group
3131	PSI	Portable Source Initiative
3132	PSI	Pounds per square inch
3133	PSS	Personnel System Support
3134	PST	Pacific Standard Time (UTC-8 hours)
3135	PSU	Pennsylvania State University
3136	PsyOp	Psychological Operations
3137	pT	picotesla
3138	Pt	Platinum
3139	PTA	Parent-Teacher Association
3140	PTAL	Public Transport Accessibility Level
3141	PTES	People's Trust for Endangered Species
3142	PTFE	PolyTetraFluoroEthylene
3143	PTI	Pardon the Interruption
3144	PTSD	Post-Traumatic Stress Disorder
3145	Pu	Plutonium
3146	Pub	Publication
3147	PUG	PET Users Group
3148	PUN	Pull-Up Network
3149	PUP	Pull-Up Point
3150	PUS	United States Miscellaneous Pacific Islands (ISO 3166 trigram; obsolete 1986)
3151	PV	petavolt
3152	pV	picovolt
3153	PvE	Player versus Environment
3154	PvP	Player versus Player
3155	PVR	Personal Video Recorder
3156	PvZ	Plants vs. Zombies
3157	PW	Palau (postal symbol; ISO 3166 digram)
3158	pW	picowatt
3159	PWA	Pirates With Attitude
3160	PWBA	Pension and Welfare Benefits Administration
3161	PWC	PieceWise Constant (describing a mathematical function)
3162	PwC	PricewaterhouseCoopers (international accounting firm)
3163	PWL	PieceWise Linear (describing a mathematical function)
3164	PWLC	PieceWise Linear and Concave/Convex (describing a mathematical function)
3165	PWR	Pressurized Water Reactor
3166	PX	Post eXchange
3167	PYF	French Polynesia (ISO 3166 trigram)
3168	PYMWYMI	Put Your Money Where Your Mouth Is
3169	Q1	First quarter of the year
3170	Q2	Second quarter of the year
3171	Q3	Third quarter of the year
3172	Q4	Fourth quarter of the year
3173	QA	Qatar (ISO 3166 digram)
3174	Qantas	Queensland And Northern Territory Aerial Services
3175	QAT	Qatar (ISO 3166 trigram)
3176	QB	Quarterback (football)
3177	QCD	Quantum ChromoDynamics
3178	QD	quaque die (Latin for 'daily')
3179	QDR	Quadrennial Defense Review
3180	QEH	Queen Elizabeth's Hospital
3181	QK	Air Canada Jazz (IATA airline designator)
3182	QNH	Regional mean sea level atmospheric pressure (aeronautical Q code)
3183	QPS	Quark Publishing System
3184	QS	quantum sufficit (Latin, 'as much as suffices')
3185	QSCAT	Quick Scatterometer satellite
3186	QSL	Québec Sign Language
3187	QSO	Quasi-Stellar Object
3188	Quango	(British Commonwealth) QUasi Autonomous Non-Governmental Organisation
3189	Quasar	Quasi-stellar radio source
3190	QUB	Queen's University Belfast
3191	QUIET	Q and U Imaging ExperimenT (Q and U are the Stokes parameters of the CMBR polarization)
3192	qv	quod vide (Latin, 'which see')
3193	QZ	Awair (IATA airline designator)
3194	R2I	Resistance to Interrogation
3195	RA	Radio Australia
3196	Ra	Radium
3197	RAAF	Royal Australian Air Force
3198	Rabobank	Raiffeisen-Boerenleenbank (from the two banks that merged to form the modern company)
3199	RACK	Risk Aware Consensual Kink (SM phrase)
3200	Racon	RAdar beaCON
3201	RADA	Royal Academy of Dramatic Art
3202	Radar	Radio Detection And Ranging
3203	RadB	Rad51/Dmc1 homologous protein
3204	RADb	Routing Assets Data Base
3205	RADC	Region Air Defence Commander
3206	RAE	UK Royal Aircraft Establishment (-1991)
3207	RAGBRAI	Register's Annual Great Bicycle Ride Across Iowa
3208	Ramark	RAdar MARKer
3209	RAOC	Rear Area Operation Centre
3210	RARDE	UK Royal Armament Research and Development Establishment (1962-1991)
3211	RARE	Rapid Acquisition with Relaxation Enhancement (MRI technique)
3212	RATELO	Radiotelephone Operator
3213	Rb	Rubidium
3214	RB	Running Back (football)
3215	RBI	Runs Batted In
3216	RC	see entry
3217	RCAF	Royal Canadian Air Force
3218	RCC	Rescue Co-ordination Centre
3219	RCCO	Royal Canadian College of Organists
3220	RCHA	Royal Canadian Horse Artillery (regiment)
3221	RCMP	Royal Canadian Mounted Police
3222	RD	Radio Disney
3223	RDD	Radiological Dispersion Device
3224	RDM	Remotely Delivered/Deliverable Mine
3225	RDT	Remote Digital Terminal
3226	RDV	Remote Detection Vehicle
3227	Re	Rhenium
3228	RE	Royal Engineers
3229	REACT	Remote Electronically Activated Control Technology
3230	REAM	Retired Educators Association of Minnesota
3231	RECCE	Reconnaissance
3232	REEF	Reef Environmental Education Foundation
3233	REM	Rapid Eye Movement (sleep phase),Rosicrucian Egyptian Museum
3234	REME	Royal Electrical and Mechanical Engineers
3235	RERC	Rehabilitation Engineering Research Center
3236	RESNA	Rehabilitation Engineering and Assistive Technology Society of North America
3237	REU	Réunion (ISO 3166 trigram)
3238	Rf	Rutherfordium
3239	RFD	Request for Documentation
3240	RFE	Request for Evaluation
3241	RFEF	Real Federación Española de Fútbol (Spanish for Royal Spanish Football Federation)
3242	RFF	Right of First Refusal (legal term)
3243	RFID	Radio Frequency IDentification
3244	RFL	Rugby Football League
3245	RFP	Request for Proposal
3246	RFQ	Request for Quotation
3247	RFT	Request for Tender
3248	RFU	Rugby Football Union
3249	RG	Republican Guard
3250	Rg	Roentgenium
3251	RGB	Red Green Blue (colour model)
3252	RGBI	Red Green Blue Intensity (ditto)
3253	Rh	Rhodium
3254	RH	Southern Rhodesia (ISO 3166 digram; obsolete 1980)
3255	RHIC	Relativistic Heavy Ion Collider
3256	RHLI	Royal Hamilton Light Infantry (Canadian militia regiment)
3257	RHO	Southern Rhodesia (ISO 3166 trigram; obsolete 1980)
3258	RHU	Replacement Holding Unit
3259	RI	Rhode Island (postal symbol)
3260	RIAA	Recording Industry Association of America
3261	RIBA	Royal Institute of British Architects
3262	RIFA	Red imported fire ant
3263	RILA	Retail Industry Leaders Association
3264	RIMVS	Retinal Imaging Machine Vision System
3265	RINO	Republican In Name Only[1]
3266	RIP	Relief In Place,requiesca[n]t in pace (Latin for 'may he/she/they rest in peace')
3267	RISC	Reduced Instruction Set Computer
3268	RJD	Reduced Julian Day
3269	RKBA	Right to Keep and Bear Arms (Second Amendment to the United States Constitution)
3270	RKO	Radio-Keith-Orpheum Pictures
3271	RLP	Recognised [Operating/Operational] Land Picture
3272	RLS	Restless Leg Syndrome
3273	RLY	Rally Point
3274	RM	see separate disambiguation page
3275	RMC	Robert Menzies College
3276	RMDA	Records Management and Declassification Agency
3277	RMP	Recognised [Operating/Operational] Maritime Picture
3278	RN	Radio Netherlands
3279	Rn	Radon
3280	RNA	RiboNucleic Acid
3281	RNAD	Royal Naval Armaments Depot (UK)
3282	RNPS	Radio Network Planning System
3283	RNZ	Radio New Zealand
3284	RNZI	Radio New Zealand International
3285	ROA	Rate Of Ascent
3286	ROE	Rules Of Engagement
3287	ROFLOL	Rolling On the Floor Laughing Out Loud
3288	ROH	Ring of Honor
3289	ROK	Republic of Korea
3290	ROP	Render Output Pipeline
3291	ROPE	Research Opportunity and Performance Evidence
3292	ROS	Reactive Oxygen Species
3293	ROU	Romania (ISO 3166 trigram)
3294	ROV	Remotely Operated Vehicle
3295	ROZ	Restricted Operations Zone
3296	RPA	Regional Plan Association
3297	RPD	Recognition-Primed Decision-making
3298	RPF	Rwandan Patriotic Front
3299	RPL	Reverse Polish Lisp
3300	RPM	Revolutions Per Minute
3301	RPN	reverse Polish notation
3302	rps	revolutions per second
3303	RPV	Remotely Piloted Vehicle
3304	RQ	Puerto Rico (FIPS 10-4 territory code)
3305	RRB	Railroad Retirement Board
3306	RRN	Recurrence Rate Number
3307	RRP	Recurrent Respiratory Papillomatosis
3308	RRS	Racing Rules of Sailing
3309	RRSP	Registered Retirement Savings Plan (Canada; roughly equivalent to the IRA in the U.S.)
3310	RS	Russia (FIPS 10-4 country code)
3311	RSI	Repetitive Strain Injury
3312	RSJ	Rolled Steel Joist (construction)
3313	RSN	Real Soon Now (coined by author Jerry Pournelle)
3314	RSPB	(UK) Royal Society for the Protection of Birds
3315	RSPCA	Royal Society for the Prevention of Cruelty to Animals
3316	RSR	Required Supply Rate
3317	RSRE	UK Royal Signals and Radar Establishment (1976-1991)
3318	RSRI	Red Sands Research Institute
3319	RTA	Road traffic accident (British)
3320	RTBF	Radio-Télévision belge de la Communauté française
3321	RTF	Rich Text Format
3322	RTFM	the Fucking/Fine Manual
3323	RTG	Radio-isotope Thermoelectric Generator also used for Rubber Tyred Gantry crane
3324	RTI	Run-Time Infrastructure (Simulation)
3325	RTL	see entry
3326	RTP	Real-time Transport Protocol
3327	RTS	see entry
3328	RTT	Round Trip Timing
3329	RU	Russia (ISO 3166 digram)
3330	Ru	Ruthenium
3331	RUC	Royal Ulster Constabulary
3332	RUS	Russia (ISO 3166 trigram)
3333	RUSI	Royal United Services Institute for Defence Studies
3334	RW	Rwanda (ISO 3166 and FIPS 10-4 country code digram)
3335	RWA	Rwanda (ISO 3166 trigram)
3336	RWH	Rain Water Harvesting
3337	RWR	Radar Warning Receiver
3338	RWS	Remote Weapon Station
3339	Rx	Medical prescription (possibly from Latin 'recipere','to take': see entry)
3340	RX	Receive
3341	SARS	Severe Acute Respiratory Syndrome
3342	SBNO	Standing but not operating (in reference to amusement parks)
3343	SCOTUS	Supreme Court of the United States
3344	SCROTUS	So-called Ruler of the United States
3345	SDHC	Secure Digital High Capacity
3346	SDXC	Secure Digital eXtended Capacity
3347	SG	Senegal (FIPS 10-4 country code), Singapore (ISO 3166 digram), Snow Grains (METAR Code), Study Group
3348	SGOTUS	Second Gentleman of the United States
3349	SHO	Showtime (see also sho.com)
3350	SIRI	Service Interface for Real Time Information
3351	Siri	Speech Interpretation and Recognition Interface (Apple iOS software)
3352	SLOTUS	Second Lady of the United States (the vice president's wife)
3353	SoCon	Southern Conference (U.S. college sports)
3354	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)
3355	SSD	South Sudan (ISO 3166 trigram)
3356	SSDC	U.S. Space and Strategic Defense Command
3357	STB	Surface Transportation Board[2]
3358	SWAC	Southwestern Athletic Conference
3359	SWAN	System for Wearable Audio Navigation
3360	SWAT	Special Weapons And Tactics
3361	SWF	Single White Female
3362	Ta	Tantalum
3363	TAACOM	U.S. Theater Army Area Command
3364	TAADCOORD	Theatre Army Air Defence Co-ordinator
3365	TAAR	Trace Amine-Associated Receptor
3366	TAC	U.S. Tactical Air Command (1946-1992)
3367	TACAN	Tactical Air Navigation
3368	TACCO	Tactical Coordinator
3369	TACCSF	U.S. Theater Aerospace Command & Control Simulation Facility
3370	TACDAR	Tactical Detection And Reporting
3371	TACSOP	Tactical SOP (Standing Operating Procedure)
3372	TADIL	Tactical Digital Information Link
3373	TAI	Target[ed] Area of Interest
3374	TAJ	Tom and Jerry
3375	TAJT	Tom and Jerry Tales
3376	TALES	Technical Advice and Lexicon for Enabling Simulation
3377	TANJ	There Ain't No Justice (used as expletive in the Ringworld novels)
3378	TANP	Terrain-Aware Network Planner
3379	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)
3380	TAPPS	Texas Association of Private and Parochial Schools
3381	TARDIS	Time And Relative Dimension In Space (from Doctor Who)
3382	TAS	Tasmania (postal symbol)
3383	TASER	Thomas A. Swift's Electric Rifle
3384	TASM	Tactical Air-to-Surface Missile
3385	TAT	Tourism Authority of Thailand
3386	TATP	TriAcetone TriPeroxide
3387	TATT	Tired All The Time (medical diagnosis in-joke)
3388	Tb	Terbium
3389	TB	Tuberculosis
3390	TBA	to be announced
3391	TBBPA	TetraBromoBisPhenol-A
3392	TBD	to be done, or: to be documented, or: to be determined, or: to be decided
3393	TBF	to be fair
3394	TBH	To Be Honest
3395	TBL	Turkish Basketball League
3396	TBS	Turner Broadcasting System
3397	TBT	Tributyltin
3398	Tc	Technetium
3399	TCAA	Top Counter-Assault Agents
3400	TCAS	Traffic Collision Avoidance System
3401	TCCCS	Tactical Command,Control and Communication System
3402	TCD	Chad (ISO 3166 trigram)
3403	TCHD	Truck Cargo Heavy Duty
3404	TCL	Tool Command Language
3405	TCM	Turner Classic Movies
3406	TCU	Texas Christian University
3407	TCW	Tasty Coma Wife
3408	TCWMS	Tele-Center Workforce Management System
3409	TDA	The Disney Afternoon
3410	TDL	Tactical Data Link
3411	TDM	Time-Division Multiplexing
3412	TDMA	Time Division Multiple Access
3413	TDP	Technology Demonstration Programme
3414	TDRS	Tracking Data and Relay Satellite
3415	Te	Tellurium
3416	TEAL	Tasman Empire Airways Limited
3417	Team	Together everyone achieves more
3418	TEAMS	The East African Marine System (fiber optic cable)
3419	TED	Technology Entertainment Design prize
3420	TENCAP	Tactical Exploitation of National Capabilities
3421	TERS	Tactical Event Reporting System
3422	TES	Tactical Event System
3423	TEST	Thesaurus of Engineering and Scientific Terms
3424	TEU	Twenty-foot equivalent unit (cargo capacity)
3425	TeVeS	Tensor Vector Scalar theory
3426	TFMPP	Trifluorophenylmethylpiperazine
3427	TFR	Total Fertility Rate
3428	TFT	Thin-Film Transistor
3429	Tg	Teragram
3430	TG	Togo (ISO 3166 digram)
3431	TGO	Togo (ISO 3166 trigram)
3432	Th	Thorium
3433	THA	Thailand (ISO 3166 trigram)
3434	THAAD	Terminal High Altitude Area Defence
3435	THEGENTRY	The High-End Group of Earth's New Technologies Research Yield
3436	THEL	Tactical High Energy Laser ACTD
3437	THG	Tetrahydrogestrinone
3438	TIA	Total Information Awareness initiative
3439	TIA	Transient Ischemic Attack
3440	TIALD	Thermal Imaging and Airborne Laser Designation
3441	TIBS	Tactical Information Broadcast System
3442	TIC	Troops In Contact
3443	TIGERS	Topologically Integrated Geographic Encoding and Referencing System
3444	TINC	There Is No Cabal
3445	TIP	Thermal Identification Panel
3446	tits	Toes in the Sand
3447	TJD	Truncated Julian Day
3448	TJK	Tajikistan (ISO 3166 trigram)
3449	TKL	Tokelau (ISO 3166 trigram)
3450	TKM	Turkmenistan (ISO 3166 trigram)
3451	Tl	Thallium
3452	TLA	Three-Letter Abbreviation/Acronym
3453	TLAM	Tomahawk Land Attack Missile
3454	TLATOJL	The Life and Times of Juniper Lee
3455	TLPM	T1 Line Performance Monitor
3456	Tm	Terametre
3457	TMAP	Texas Medication Algorithm Project
3458	TMC	The Movie Channel
3459	TMD	Theatre Missile Defence
3460	TMDK	The Mighty Don't Kneel (Australian professional wrestling stable also active in Japan)
3461	TMI	Too Much Information
3462	TMJ	TemporoMandibular Joint (syndrome)
3463	TMNT	Teenage Mutant Ninja Turtles
3464	TMPG	Transparent Multi-Platform Gateway
3465	TMR	Twin Main Rotors (helicopter type)
3466	TMS	Transcranial Magnetic Stimulation
3467	TMT	Thirty Meter Telescope
3468	TMTOWTDI	There's Than One Way To Do It (from Perl)
3469	TNA	Total Nonstop Action Wrestling
3470	TNO	Trans-Neptunian Object
3471	TOBS	Time of OBServation
3472	TOC	Table Of Contents, Tactical Operations Centre, Temporo-Occipital transition Cortex, Top of Concrete
3473	TOG	Togo (IOC and FIFA trigram,but not ISO 3166)
3474	TOGS	Thermal Observation Gunnery Sight
3475	TOMS	Total Ozone Mapping Spectrometer (satellite instrument)
3476	TON	Tonga (ISO 3166 trigram)
3477	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
3478	TOT	Time On Target
3479	TOW	Tube-launched,Optically tracked,Wire-guided (anti-tank missile)
3480	TP	East Timor (ISO 3166 digram; obsolete 2002),São Tomé and Príncipe (FIPS 10-4 country code),Training Practice,Trident Ploughshares
3481	TPE	Chinese Taipei (IOC and FIFA trigram for the country also known as Taiwan)
3482	TPI	The point is
3483	TPO	Thrombopoietin
3484	TPS	The Pennington School
3485	TPTB	The Powers That Be (often used to refer to the people responsible for the content of TV series or movies)
3486	TQ	Top Qualifier (similar to Pole Position in car racing)
3487	TRA	Technology iness Assessment
3488	TRAC	(U.S. Army) TRADOC Analysis Center
3489	TRACON	Terminal Radar Approach Control
3490	TRADOC	(U.S. Army) Training and Doctrine Command
3491	TRANSCOM	U.S. Transportation Command
3492	TRAP	Tactical Receive equipment and related Applications
3493	TRASANA	TRADOC Systems Analysis Agency
3494	TRD	Towed Radar Decoy
3495	TRIGAT	Third Generation Antitank (missile)
3496	TRL	Technology readiness level
3497	Trp	Troop
3498	TRU	Transuranic
3499	TRUEX	Training in Urban Environment Exercise
3500	TRW	Thompson Ramo Wooldridge Inc.
3501	Ts	Terasecond
3502	TS	Terasiemens,Thunderstorm (METAR code),Tunisia (FIPS 10-4 country code),TinySex,Transsexual, Tough Sh*t
3503	TSA	Theatre Storage Area,Time Slot Allocation,Transportation Security Administration,The Salvation Army
3504	TSEC	Transmission Security Encryption Code
3505	TSL	Transportation Security Laboratory
3506	TSN	The Sporting News (historic name of the periodical now known as Sporting News),The Sports Network
3507	TSO	The Stationery Office (was HMSO until 1996),(U.S.) TRICARE Support Office,Trans-Siberian Orchestra (band)
3508	TSOP	Tactical Standing Operation Procedure,The Sound of Philadelphia (classic 1970s R&B instrumental)
3509	TSR	Terminate and Stay Resident
3510	TSSIA	The Subject Says It All
3511	TT	Teratesla,Terrestrial Time,Tourist Trophy (Motorcycle sport),Trinidad and Tobago (ISO 3166 digram)
3512	TTCT	Torrance Tests of Creative Thinking
3513	TTFN	Ta Ta For Now
3514	TTL	Tax,Title,License,Through-the-lens (photography),Time 'till live,Time to live,Transistor-transistor logic
3515	TTO	Trinidad and Tobago (ISO 3166 trigram)
3516	TTP	Tactics,Techniques,and Procedures,Thrombotic thrombocytopenic purpura,Trailer Transfer Point
3517	TTTEAF	Thomas the Tank Engine and Friends
3518	TTY	TeleTYpewriter (Printer)
3519	TTYL	To You Later (Internet slang)
3520	TTZ	Tetrazolium
3521	TU	Technische Universität (German for 'Technical University'),Thammasat University (Thailand),Turkey (FIPS 10-4 country code)
3522	TUC	Trades Union Congress
3523	TUG	TeX Users Group
3524	TUI	Text-based user interface (cf. CLI),among other uses
3525	TUM	Technische Universität München (Germany)
3526	TUN	Tunisia (ISO 3166 trigram)
3527	TUNS	Technical University of Nova Scotia
3528	TUR	Turkey (ISO 3166 trigram)
3529	TUSK	Tank Urban Survival Kit
3530	TUV	Tuvalu (ISO 3166 trigram)
3531	TV	Television,Teravolt,Transvestite,Tuvalu (ISO 3166 and FIPS 10-4 country code digram)
3532	Tv	Time value,a designation seen on some camera dials for shutter priority mode
3533	TVA	Tennessee Valley Authority
3534	TVG	Television Games (Network),Tick,Very Good,Often used by School Teachers when marking homework etc. (Tick VG)[1][2]
3535	TVR	TreVor (Wilkinson) Racing
3536	TVS	Tornado vortex signature
3537	TW	Republic of China (Taiwan) (ISO 3166 and FIPS 10-4 country code digram),Terawatt
3538	TWAIN	Technology Without An Interesting Name
3539	TWE	Trans World Entertainment
3540	TWI	The Welding Institute
3541	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
3542	TWN	Republic of China (Taiwan) (ISO 3166 trigram)
3543	TWP	Technical Working Paper
3544	TWS	Thermal Weapon Sight,Track While Scan
3545	TX	Texas (postal symbol),Transmit,Turkmenistan (FIPS 10-4 country code)
3546	TXV	Thermostatic Expansion Valve
3547	TYT	Take Your Time,Internet chat abbreviation
3548	TZ	Tanzania (ISO 3166 and FIPS 10-4 country code digram)
3549	TZA	Tanzania (ISO 3166 trigram)
3550	TZC	Tetrazolium chloride
3551	U	Uranium
3552	UA	Unit of Action
3553	UAAP	University Athletic Association of the Philippines
3554	UAB	University of Alabama at Birmingham
3555	UAP	Unidentified Areal Phenomana
3556	UAV	Unmanned Aerial Vehicle,Unprotected Anal and Vaginal sex,UB[edit]
3557	UBC	United Baptist Church,University of British Columbia
3558	UBI	Universal Basic Income
3559	UBIGEO	Ubicación Geografica (Spanish for Geographical Location)
3560	UBS	Unbundled Bitstream Services,United Bank of Switzerland,United Banque Suisse
3561	UCBSA	United Cricket Board of South Africa
3562	UCF	University of Central Florida
3563	UCLA	University of California at Los Angeles
3564	UCLES	University of Cambridge Local Examinations Syndicate
3565	UCR	University of California at Riverside
3566	UCR	University of Costa Rica
3567	UCS	Union of Concerned Scientists
3568	UCSB	University of California at Santa Barbara
3569	UCSD	University of California at San Diego
3570	UDAS	Uppsala-DLR Asteroid Survey
3571	UDDI	Universal Description,Discovery and Integration
3572	UDTS	Uppsala-DLR Trojan Survey
3573	UE	Unit of Employment
3574	UEFA	Union of European Football Associations
3575	UESAC	Uppsala-ESO Survey of Asteroids and Comets
3576	UFC	Ultimate Fighting Championship
3577	UFO	Unidentified Flying Object, or: United Farmers of Ontario
3578	UGV	Unmanned Ground Vehicle
3579	UHF	Ultra High Frequency
3580	UHMW	Ultra-High Molecular Weight
3581	UHRB	Ultra-High Resolution Building (simulation)
3582	UIC	University of Illinois at Chicago
3583	UID	User ID
3584	UIUC	University of Illinois at Urbana-Champaign
3585	UJTL	Universal Joint Task List
3586	UKIP	United Kingdom Independence Party
3587	UKR	Ukraine (ISO 3166 trigram)
3588	UL	Underwriters Laboratories
3589	ULF	Ultra Low Frequency
3590	UM	U.S. Minor Outlying Islands (postal symbol; ISO 3166 digram)
3591	UMCP	Unit Maintenance Collection Point
3592	UMES	University of Maryland Eastern Shore
3593	UMI	U.S. Minor Outlying Islands (ISO 3166 trigram)
3594	UMIST	University of Manchester Institute of Science and Technology
3595	UMTS	Universal Mobile Telecommunications System
3596	UN	United Nations
3597	UNABOM	University and airline bomber (FBI case name)
3598	UNAIDS	Joint United Nations Programme on HIV/AIDS
3599	UNAMSIL	United Nations Mission in Sierra Leone
3600	UNCF	United Negro College Fund
3601	UNCLOS	United Nations Convention on the Law of the Sea
3602	UNCSGN	United Nations Conference on the Standardization of Geographical Names
3603	UNCTAD	United Nations Conference on Trade and Development
3604	UNDCP	United Nations Drug Control Programme
3605	UNDE	Union of National Defence Employees (Canada)
3606	UNDP	United Nations Development Programme
3607	UNEP	United Nations Environment Programme
3608	UNFCCC	United Nations Framework Convention on Climate Change
3609	UNFICYP	United Nations Peacekeeping Force in Cyprus
3610	UNGEGN	United Nations Group of Experts on Geographical Names
3611	UNHCR	United Nations High Commission (er) for Refugees
3612	UNICEF	United Nations Children's Fund (originally the United Nations International Children's Emergency Fund)
3613	UNICRI	United Nations Interregional Crime and Justice Research Institute
3614	UNIDO	United Nations Industrial Development Organization
3615	UNIFEM	United Nations Development Fund for Women (from the French Fonds de développement des Nations unies pour la femme)
3616	UNLV	University of Nevada,Las Vegas
3617	UNMIK	United Nations Interim Administration Mission in Kosovo
3618	UNOSOM	United Nations Operations in Somalia
3619	UNPROFOR	United Nations Protection Force (in former Yugoslavia)
3620	UNRISD	United Nations Research Institute for Social Development
3621	UNSM	Union of Nova Scotian Municipalities
3622	UNTAC	United Nations Transitional Authority in Cambodia
3623	UNTAET	United Nations Transitional Administration in East Timor
3624	UNU	United Nations University
3625	UPdM	Università Popolare della Multimedialità
3626	UPF	Universitat Pompeu Fabra (Catalan for: 'Pompeu Fabra University')
3627	UPI	United Press International
3628	UPN	United Paramount Network
3629	UPU	Universal Postal Union
3630	UR	Soviet Union (NATO country code,obsolete 1992)
3631	URBSFA	Union royale belge des sociétés de football association (French for Royal Belgian Football Association)
3632	URD	User Requirements Document
3633	URI	University of Rhode Island
3634	URU	Uruguay (IOC and FIFA trigram, but not ISO 3166)
3635	URY	Uruguay (ISO 3166 trigram)
3636	US	United States (also ISO 3166 and FIPS 10-4 country code digram)
3637	USA	United States of America (also ISO 3166 trigram), United States Army
3638	USAADAC	U.S. Army Air Defense Artillery Center,Fort Bliss,Texas
3639	USAARMC	U.S. Army ARMor Center,Fort Knox,Kentucky
3640	USAAVNC	U.S. Army AViatioN Center,Fort Rucker,Alabama
3641	USAFSPC	U.S. Air Force Space Command
3642	USAIC	U.S. Army Infantry Center,U.S. Army Intelligence Center
3643	USAID	United States Agency for International Development
3644	USAP	Union Sportive des Arlequins Perpignanais,United States Antarctic Program
3645	USAPATRIOT	Uniting and Strengthening America by Providing Appropriate Tools Required to Intercept and Obstruct Terrorism
3646	USAREUR	United States Army Europe
3647	USB	Universal Serial Bus
3648	USC	United States Code,University of South Carolina,University of Southern California
3649	USCG	United States Coast Guard
3650	USCINCSPACE	United States Commander in Chief,Space Command
3651	USDA	United States Department of Agriculture
3652	USDI	United States Department of the Interior
3653	USDOE	United States Department of Energy
3654	USDRE	(U.S.) Under-Secretary of Defense for Research and Engineering (1978-1986)
3655	USEC	United States Enrichment Corporation
3656	USFL	United States Football League
3657	USFWS	United States Fish and Wildlife Service
3658	USGS	United States Geological Survey
3659	USIA	United States Information Agency
3660	USJFCOM	United States Joint Forces Command
3661	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
3662	USMC	United States Marine Corps
3663	USMNT	United States men's national (soccer) team
3664	USN	United States Navy
3665	USNA	United States National Arboretum,United States Naval Academy
3666	USNB	United States Naval Base
3667	USNG	United States National Grid
3668	USNH	United States Naval Hospital
3669	USNI	United States Naval Institute
3670	USNO	U.S. Naval Observatory
3671	USNOFS	United States Naval Observatory Flagstaff Station
3672	USNP	United States Newspaper Program
3673	USNR	United States Navy Reserve
3674	USNS	United States Naval Ship
3675	USNY	University of the State of New York (usually pronounced 'use-knee')
3676	USNZ	University Sport New Zealand
3677	USPS	United States Postal Service
3678	USPTO	United States Patent and Trademark Office
3679	USR	User
3680	USS	United States ship (sometimes meaningless; see Star Trek)
3681	USSPACECOM	United States Space Command
3682	USSR	Union of Soviet Socialist Republics
3683	UST	Underground Storage Tank
3684	USTRANSCOM	United States Transportation Command
3685	USWNT	United States women's national (soccer) team
3686	UT	Universal Time
3687	UTEP	University of Texas at El Paso (pronounced you-tep)
3688	UTM	Universal Transverse Mercator (geographical co-ordinate system)
3689	UUA	Unitarian Universalist Association
3690	UUID	Universally Unique Identifier (see also GUID)
3691	UUV	Unmanned Underwater Vehicle
3692	UW	University of Washington
3693	UWO	University of Western Ontario
3694	UWT	Under Water Telephone
3695	UWTG	Under Water Tug
3696	UWW	United World Wrestling
3697	UXO	Unexploded Ordnance
3698	UY	Uruguay (ISO 3166 and FIPS 10-4 country code digram)
3699	UZ	Uzbekistan (ISO 3166 and FIPS 10-4 country code digram)
3700	UZB	Uzbekistan (ISO 3166 trigram)
3701	VACIS	Vehicle And Container Inspection System
3702	VACIS	Victorian Ambulance Clinical Information System
3703	VANOS	Variable Nockenwelle System
3704	VAO	Vienna Art Orchestra
3705	VAT	Vatican City-State (ISO 3166 trigram)
3706	VBA	Visual Basic for Applications
3707	vCJD	Variant Creutzfeldt-Jakob Disease
3708	VCNO	(U.S.) Vice Chief of Naval Operations
3709	VCofS	Vice Chief of Staff
3710	VCR	Video cassette recorder
3711	VCT	Saint Vincent and the Grenadines (ISO 3166 trigram)
3712	VDFS	VisualSVN Distributed File System (VDFS)
3713	VE	Venezuela (ISO 3166 digram)
3714	VEEGA	Venus Earth Earth Gravity Assist manœuvre
3715	VEN	Venezuela (ISO 3166 trigram)
3716	VERITAS	Very Energetic Radiation Imaging Telescope Array System
3717	VfD	s for deletion (used in Wikipedia)
3718	VFM	Value For Money
3719	VFMO	Very Fast Moving Object (astronomy)
3720	VFT	Virtual Function Table
3721	VFW	Veterans of Foreign Wars
3722	VG	British Virgin Islands (ISO 3166 digram)
3723	VGB	British Virgin Islands (ISO 3166 trigram)
3724	VH1	Video Hits One
3725	VHF	Very High Frequency
3726	VIA	Versatile Interface Adapter
3727	VIDS	Visual Information Display System
3728	VII	7 (in Roman numerals)
3729	VIII	8 (in Roman numerals)
3730	VIN	Vehicle Identification Number (ISO 3779)
3731	VIP	Very Important Person
3732	VISCII	VIetnamese Standard Code for Information Interchange
3733	VIT	Vellore Institute of Technology
3734	VIVO	Video In Video Out
3735	VJ	Video Jockey
3736	VLAD	Vertical Line Array DIFAR
3737	VLBA	Very Long Baseline Array
3738	VLF	Very Low Frequency
3739	VLIW	Very Long Instruction Word
3740	VLPFC	VentroLateral PreFrontal Cortex
3741	VLPMC	VentroLateral PreMotor Cortex
3742	VLSI	Very-large-scale integration
3743	VM	Vietnam (FIPS 10-4 country code)
3744	VMF	Marine Fighting Squadron of the United States Marine Corps
3745	VMF	Variable Message Format
3746	VMN	VentroMedial Nucleus (neurophysiology)
3747	VN	Vietnam (ISO 3166 digram)
3748	VNIR	Visible and Near InfraRed
3749	VNM	Vietnam (ISO 3166 trigram)
3750	VNS	see entry
3751	VOA	Voice of America
3752	VOIP	Voice Over Internet Protocol
3753	VOLT	Visual OpenType Layout Tool
3754	VON	Victorian Order of Nurses
3755	VOR	Voice of Russia
3756	VOX	Voice Operated oscillator
3757	VPOTUS	Vice President of the United States
3758	VR	Virtual Reality
3759	VRSG	Virtual Reality Scene Generator
3760	VSAT	Very Small Aperture Terminal ('vee-satt')
3761	VSHORAD	Very Short Range Air Defence
3762	VSO	Voluntary Services Overseas
3763	VSR	Very Special Relativity
3764	VTC	Video Tele-Conference
3765	VTEC	Variable valve Timing and Electronic lift Control
3766	VU	Vanuatu (ISO 3166 digram), Vedanta University
3767	VUB	Vrije Universiteit Brussel (Belgian university)
3768	VUT	Vanuatu (ISO 3166 trigram)
3769	VV	Via Voice,Village Voice
3770	VVAF	Vietnam Veterans of America Foundation
3771	VW	Volkswagen
3772	VZ	Verizon Communications (NYSE code)
3773	W	Tungsten (from German Wolfram),Watt,West
3774	W3C	World Wide Web Consortium
3775	WA	Namibia (from West Africa),Washington state (postal symbol),Western Australia (postal symbol),World Archery (Federation)
3776	WAAC	Women's Army Auxiliary Corps (Britain) (World War I UK)
3777	WAAF	Women's Auxiliary Air Force (World War II UK)
3778	WAC	Western Athletic Conference,Women's Auxiliary Corps (World War II Canada),Women's Army Corps (World War II U.S.)
3779	WACC	Weighted Average Cost of Capital (accounting)
3780	WACS	What-A-Cartoon! Show
3781	WAD	Weapons Alert Designator
3782	WAGGGS	World Association of Girl Guides and Girl Scouts
3783	WAGs	Wives And Girlfriends (most notably of England national football team players at the 2006 FIFA World Cup,although the term existed earlier)
3784	WAL	see entry
3785	WAPIMA	What a pain in my ass
3786	WAR	With All Respect
3787	WAsP	Short form of WAAAAP (Wind Atlas Analysis and Application Program)
3788	WAYP	White And Yellow Pages
3789	WB	Warner Bros.,Welcome Back (Internet shorthand)
3790	Wb	Weber
3791	WBA	Warner Bros. Animation,West Bromwich Albion (F.C.),World Boxing Association
3792	WBC	World Boxing Council
3793	WBE	Work Breakdown Element
3794	WBO	World Boxing Organization
3795	WC	Water Closet,Winston Churchill,World Cup (sports)
3796	WCBO	World Chess Boxing Organisation
3797	WCBP	World Center for Birds of Prey
3798	WCL	World Confederation of Labour
3799	WCS	Weapon Control Status,Wildlife Conservation Society
3800	WCW	World Championship Wrestling
3801	WDC	Western Design Center,World Data Center
3802	WDIN	Wildlife Disease Information Node
3803	WDWR	Walt Disney World Resort
3804	WEBS	Weapon Effectiveness Battle Simulation
3805	WEC	World Extreme Cagefighting
3806	WEEE	Waste Electrical and Electronic Equipment
3807	WEF	World Economic Forum
3808	WEM	West Edmonton Mall
3809	WEU	Western European Union
3810	WEZ	Weapon Engagement Zone
3811	WF	Wallis and Futuna Islands (ISO 3166 digram)
3812	WFC	Women's Forage Corps (World War II UK)
3813	WFD	Weapon of Focused Destruction
3814	WFF	Wallops Flight Facility
3815	WFI	Water for Injection
3816	WFH	Working from home
3817	WFP	World Food Program
3818	WFZ	Weapons Free Zone
3819	WH	Wehrmacht Heer (German World War II army vehicle licence plate code)
3820	WHAM	Wisconsin Hydrogen-Alpha Mapping (telescope)
3821	WHI	Women's Health Initiative
3822	WHIP	Walks plus hits per inning pitched
3823	WHO	World Health Organisation
3824	WHS	(U.S.) Washington Headquarters Services
3825	WI	Western Sahara (FIPS 10-4 country code),Wisconsin (postal symbol),Women's Institute
3826	WIA	Wounded In Action,Wireless Institute of Australia (Amateur Radio)
3827	WIIFM	What's in it for me?
3828	WIMP	Weakly Interacting Massive Particle, Windows,Icons,Menus,Pointers
3829	WIP	Work In Progress
3830	WIPO	World Intellectual Property Organization
3831	WIPP	[Nuclear] Waste Isolation Pilot Plant
3832	WIYN	Wisconsin Indiana Yale NOAO telescope consortium
3833	WK	Wake Island (ISO 3166 digram,obsolete 1986)
3834	WKYP	Will Keep You Posted
3835	WL	Wehrmacht Luftwaffe (German World War II air force vehicle licence plate code)
3836	WLB	Women's Land Brigade (World War II Canada)
3837	WLF	Wallis and Futuna Islands (ISO 3166 trigram)
3838	WLOG	Without Loss Of Generality (see WOLOG)
3839	WM	Wehrmacht Marine (German World War II navy vehicle licence plate code)
3840	WMANUS	West Midlands Area National Union of Students
3841	WMD	World Movement for Democracy
3842	WMI	Wildlife Management Institute
3843	WMO	World Meteorological Organization
3844	WNA	World Nuclear Association
3845	WNF	Will Not Fix
3846	WNIT	Women's National Invitation Tournament
3847	WNSD	What's New,Scooby-Doo?
3848	WNW	West North-West
3849	WO	Warrant Officer
3850	WOF	Width of Fabric
3851	WOFT	Waste Of Fucking Time
3852	WOFTAM	Waste Of Fucking Time And Money
3853	WOI	Wheels Of Italy
3854	WOM	Write Only Memory
3855	WOS	Wilson Ornithological Society
3856	WOSM	World Organization of the Scout Movement, Worldwide Oil Spill Model
3857	WOT	Waste Of Time
3858	WP	White Phosphorus (ammunition)
3859	WPB	War Production Board during World War II
3860	WPE	World Pork Expo
3861	WPK	Wider Peacekeeping
3862	WPT	World Poker Tour,World Premiere Toons
3863	WR	Wide Receiver (football)
3864	WRAC	Women's Royal Army Corps (World War II UK)
3865	WRAIR	Walter Reed Army Institute of Research
3866	WRBWWRM	We Best What We Most
3867	WRC	World Rally Championship
3868	WRC	World Religions Conference
3869	WRNG	Warning
3870	WRS	Worldwide Reference System
3871	WRT	With respect to (especially in fields such as Mathematics)
3872	WRT	NHS Workforce Review Team
3873	WRT	The Linksys routers whose model name start with 'WRT'
3874	WRT	Third party firmware for the Linksys WRT routers and compatible models from other vendors.
3875	WRT	Wallace Roberts & Todd,LLC (Urban Planning and Design)
3876	WRT	Web Runtime (WRT) is a portable application framework developed by Nokia that allows the creation of widgets on the S60 Platform.
3877	WRT	Wholesale,Trade,Retail sector,category in employment and economics statistics
3878	WRT	Wireless Receiver/Transmitter (computer networks/IT)
3879	WRT	Wireless Ronin Technologies (digital signage)
3880	WRT	World Rally Team
3881	WRT	Writer Response Theory
3882	WRVS	Women's Royal Voluntary Service,now only known by the acronym (UK)
3883	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)
3884	WSC	Weapon System Catalogue
3885	WSDL	Web Services Description Language
3886	WSJ	(The) Wall Street Journal
3887	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)
3888	WSROC	Western Sydney Regional Organisation of Councils
3889	WSSM	Winchester Super Short Magnum (family of rifle cartridges)
3890	WSTC	Women Signallers Territorial Corps (World War II UK)
3891	WSW	West South-West
3892	WTB	Wales Tourism Board,Warenterminbörse Hannover
3893	WTC	World Trade Center
3894	WTF	What the fuck?; also What a Terrible Failure (android)
3895	WTFH	What The Fucking Hell
3896	WTH	What the Hell
3897	WTO	World Trade Organization
3898	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)
3899	WUBU2	What you been up to
3900	WUU2	What you up to (Internet slang popular with teenagers)
3901	WV	West Virginia (postal symbol)
3902	WVA	World Veterinary Association
3903	WVIAC	West Virginia Intercollegiate Athletic Conference
3904	WVR	Women's Volunteer Reserve (World War II UK)
3905	WVSC	Women's Volunteer Service Corps (World War II Canada)
3906	WVU	West Virginia University
3907	WW	see entry
3908	WWE	World Wrestling Entertainment
3909	WWI	World War I
3910	WWII	World War II
3911	WWIII	World War III
3912	WWJD	What would Jesus do?
3913	WWS	Wheaton Warrenville South High School
3914	WWWF	World Wide Wrestling Federation
3915	WXO	Weather [Executive] Officer
3916	WY	Wyoming (postal symbol)
3917	WZ	Swaziland (FIPS 10-4 country code)
3918	XBML	eXtended Business Modelling Language
3919	XC	Ninety (in Roman numerals)
3920	XCBL	XML Common Business Library
3921	XD	Used in chatrooms or email for smiley face. X is the eyes; squinted D is the mouth; XD.
3922	Xe	Xenon
3923	XFA	XML Forms Architecture
3924	XFC	Xtreme Fighting Championships
3925	XFD	Fighter aircraft made by Douglas
3926	Xfe	X File Explorer
3927	XFF	X-Forwarded-For
3928	XFG	Exfoliation glaucoma
3929	XFR	Automobile made by Jaguar
3930	XFT	X FreeType interface library
3931	XG	Automobile made by Hyundai
3932	XGA	Extended Graphics Array
3933	XGP	Extreme Game Player
3934	XHTML	eXtensible Hypertext Markup Language
3935	XI	Eleven (in Roman numerals)
3936	XII	Twelve (in Roman numerals)
3937	XIII	Thirteen (in Roman numerals)
3938	XIV	Fourteen (in Roman numerals)
3939	XIX	Nineteen (in Roman numerals)
3940	XJS	Automobile made by Jaguar
3941	XKB	X keyboard extension
3942	XKE	Automobile made by Jaguar
3943	XKR	Automobile made by Jaguar
3944	XML	eXtensible Markup Language
3945	XMSF	eXtensible Modelling and Simulation Framework
3946	XNA	X-No-Archive,Xeno Nucleic Acid
3947	XNC	X Northern Captain
3948	XNU	X is Not Unix
3949	XP	eXperience Point (role-playing games)
3950	XQJ	XQuery API for Java™
3951	XRAY	X-Ray
3952	XRML	eXtensible Rights Markup Language
3953	XS	Xiaolin Showdown
3954	XSL	eXtensible Style Language
3955	XTMH	eXtreme Technology Multiprocessor Hyperlanguage
3956	XUL	XML User Interface Language
3957	XV	Fifteen (in Roman numerals)
3958	XVI	Sixteen (in Roman numerals)
3959	XVII	Seventeen (in Roman numerals)
3960	XVIII	Eighteen (in Roman numerals)
3961	XWF	Xcitement Wrestling Federation
3962	XX	Twenty (in Roman numerals)
3963	Xyl	Xylobium
3964	XZN	Triple square screw driver
3965	y	Yocto-
3966	Y2K	Year Two Thousand
3967	yA	Yoctoampere
3968	Ya	Yottayear
3969	YaBPr	Yet another Brother Pat rant
3970	YABSLAG	Yet another boy singing like a girl
3971	YAC	Youth-Adult Committee
3972	YAFLA	Yet Another Five Letter Abbreviation
3973	YAP	Young Aspiring Professional
3974	YB	Youcef Benzouada (Southern Algerian name)
3975	Yb	Ytterbium
3976	yC	Yoctocoulomb
3977	YC	Yottacoulomb
3978	YDS	Yosemite Decimal System (climbing)
3979	YE	Yemen (ISO 3166 digram)
3980	YEM	Yemen (ISO 3166 trigram)
3981	yF	Yoctofarad
3982	YF	Yottafarad
3983	yg	Yoctogram
3984	Yg	Yottagram
3985	YGCO	Yamaneko Group of Comet Observers
3986	Ygo	Yu-Gi-Oh!
3987	yH	Yoctohenry
3988	YH	Yottahenry
3989	YHBT	You Have Been Trolled
3990	YHII	You Have It Inside
3991	YHS	Ya Hoor sur!
3992	Yi	Yobi
3993	Yippie	Youth International Party + suffix
3994	yJ	Yoctojoule
3995	YJ	Yottajoule
3996	yK	Yoctokelvin
3997	YK	Yottakelvin
3998	YKYFCW	You know you're from Christchurch when (post-earthquake joke)
3999	yL	Yoctolitre
4000	YL	Yottalitre
4001	ym	Yoctometre
4002	Ym	Yottametre
4003	YMMD	You Make My Day
4004	yN	Yoctonewton
4005	YN	Yottanewton
4006	YOLO	You Only Live Once
4007	YPA	Yards per Pass Attempt (football statistic)
4008	YPIO	Your Problem Is Obvious
4009	YPO	Young Presidents' Organization
4010	ys	Yoctosecond
4011	yS	Yoctosiemens
4012	Ys	Yottasecond
4013	YS	Yottasiemens
4014	YSI	Young Scots for Independence
4015	yT	Yoctotesla
4016	YTD	Year-To-Date
4017	YTM	Yield to Maturity
4018	YTS	Youth Training Scheme
4019	YTT	Yoshi Topsy-Turvy
4020	Yuppie	Young Urban Professional + suffix
4021	yV	Yoctovolt
4022	YV	Yottavolt
4023	yW	Yoctowatt
4024	YW	Yottawatt
4025	YYH	YuYu Hakusho
4026	z	Zepto
4027	Z	Zetta
4028	zA	Zeptoampere
4029	ZAF	South Africa (ISO 3166 trigram)
4030	ZAMS	Zero age main sequence
4031	ZAS	Zylinder Abschaltung System
4032	ZBT	Zero-Balance Transfer (accounting)
4033	zC	Zeptocoulomb
4034	ZC	Zettacoulomb
4035	ZCM	(n) ZENworks Configuration Management
4036	ZCMK	Zone Control Master Key
4037	ZCU	Zimbabwe Cricket Union
4038	\a	Atto-