ISO 639 is one of several international standards that list short codes for language names. The Ethnologue started using ISO 639-3 codes with the 15th edition.
ISO 639 consists of different parts, of which two parts are currently published. The other parts are works in progress.
There are two items for ISO 639 and one DIS:

Codes for the Representation of the Names of Languages - Documents the essential information from ISO 639, Codes for the Representation of the Names of Languages.
ISO 639 - Code for the representation of names of languages.
ISO 639 - Codes for the Representation of the Names of Languages. A useful list.
ISO 639-1 and ISO 639-2: International Standards for Language Codes. ISO 15924: International Standard for names of scripts - 65th IFLA Council and General Conference - Conference Programme and Proceedings - An overview and history of the standard.
ISO 639-2 Codes for languages - Library of Congress document contains the ISO 639-2 Alpha-3 and Alpha-2 codes for languages.
Meta Description: [ This document contains the ISO 639-2 Alpha-3 codes for the representation of names of languages ]
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