nushell/crates/nu-protocol/src/value/unit.rs

#[derive(Debug, Clone, Copy)]
pub enum Unit {
    // Filesize units: metric
    Byte,
    Kilobyte,
    Megabyte,
    Gigabyte,
    Terabyte,
    Petabyte,

    // Filesize units: ISO/IEC 80000
    Kibibyte,
    Mebibyte,
    Gibibyte,
    Tebibyte,
    Pebibyte,

    // Duration units
    Nanosecond,
    Microsecond,
    Millisecond,
    Second,
    Minute,
    Hour,
    Day,
    Week,
}