Codes for the Representation of Names of Languages Codes arranged alphabetically by alpha-3/ISO 639-2 Code Note: ISO 639-2 is the alpha-3 code in Codes for the representation of names of languages-- Part 2. There are 21 languages that have alternative codes for bibliographic or terminology purposes. In those cases, each is listed separately and they are designated as "B" (bibliographic) or "T" (te