ISO 639

ISO 639 is a standard by the International Organization for Standardization (ISO) concerned with representation of languages and language groups. It currently consists of four sets (1-3, 5) of code, named after each part which formerly described respective set (part 4 was guidelines without its own coding system); a part 6 was published but withdrawn. It was first approved in 1967 as a single-part ISO Recommendation, ISO/R 639,^[1] superseded in 2002 by part 1 of the new series, ISO 639-1,^[2] followed by additional parts. All existing parts of the series were consolidated into a single standard in 2023,^[3] largely based on the text of ISO 639-4.