The International Organization for Standardization (ISO /ˈaɪsoʊ/ EYE-soh; French: Organisation internationale de normalisation; Russian: Международная организация по стандартизации, romanized: Meždunarodnaâ organizaciâ po standartizacii) is an independent, non-governmental, international standard development organization composed of representatives from the national standards organizations of member countries.
Membership requirements are given in Article 3 of the ISO Statutes.
ISO 639 is a standard by the International Organization for Standardization (ISO) concerned with the 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formerly described respective set (part 4 was guidelines without its own coding system); a part 6 was published but withdrawn.It was first approved in 1967 as a single-part ISO Recommendation, ISO/R 639, superseded in 2002 by part 1 of the new series, ISO 639-1, followed by additional parts. All existing parts of the series were consolidated into a single standard in 2023, largely based on the text of ISO 639-4.