ISO 639-5:2008 "Codes for the representation of names of languages—Part 5: Alpha-3 code for
ISO 639-5 defines alpha-3 (3-letter) codes, called "collective codes," that identify language families and groups.
As of the February 11, 2013 update to ISO 639-5, the standard defines 115 collective codes.
The United States
The standard does not cover all language families used by linguists. The languages covered by a group code need not be linguistically related, but may have a geographic relation, or category relation (such as