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'ISO 639' is the set of international standards that lists short codes for language names.
ISO 639 consists of different parts, of which two parts have been approved and a third part that is in the final approval (FDIS) stage. The other parts are works in progress.

★ ISO 639-1: 2002 ''Codes for the representation of names of languages -- Part 1: Alpha-2 code'' List of ISO 639-1 codes

★ ISO 639-2: 1998 ''Codes for the representation of names of languages -- Part 2: Alpha-3 code'' List of ISO 639-2 codes

★ ISO 639-3: 2007 ''Codes for the representation of names of languages -- Part 3: Alpha-3 code for comprehensive coverage of languages'' List of ISO 639-3 codes

★ ISO/CD 639-4: 2007? ''Codes for the representation of names of languages -- Part 4: Implementation guidelines and general principles for language coding''

★ ISO/DIS 639-5: 2007? ''Codes for the representation of names of languages -- Part 5: Alpha-3 code for language families and groups''

★ ISO/CD 639-6: 2007? ''Codes for the representation of names of languages -- Part 6: Alpha-4 representation for comprehensive coverage of language variation''

Contents

Use of ISO-639 codes

Alpha-2 code space

Alpha-3 code space

Alpha-4 code space

See also

External links

Use of ISO-639 codes

The language codes defined in the several sections of ISO-639 are used for bibliographic purposes and, in computing and internet environments, as a key element of locale data. The codes also find use in various applications, such as Wikipedia URLs for its different language editions.

Alpha-2 code space

"Alpha-2" codes (for codes composed of 2 letters of the basic Latin alphabet) are used in ISO 639-1. Thus, there are $26^2=676$ distinct Alpha-2 codes. This is clearly insufficient to cover all languages, which led to the creation of ISO 639-2 and the use of Alpha-3 codes.

Alpha-3 code space

"Alpha-3" codes (for codes composed of 3 letters of the basic Latin alphabet) are used in ISO 639-2 and ISO 639-3 and will eventually be used in ISO 639-5. Mathematically, the upper limit for the number of languages and language collections that can be so represented is $26^3=17,576$.
The common use of Alpha-3 codes by three parts of ISO 639 requires some coordination within a larger system.
Part 2 defines four special codes mul, und, mis, zxx, a reserved range qaa-qtz (20 × 26 = 520 codes) and has 23 double entries (the B/T codes). This sums up to 520 + 23 + 4 = 547 codes that cannot be used in part 3 to represent languages or in part 5 to represent language families or groups.
The remainder is 17,576 – 547 = 17,029.
There are somewhere around six or seven thousand languages on Earth today[1][2]. So those 17,029 codes are adequate to assign a unique code to each language, although some languages may end up with arbitrary codes that sound nothing like traditional name(s) of that language.

Alpha-4 code space

"Alpha-4" codes (for codes composed of 4 letters of the basic Latin alphabet) is proposed to be used in ISO 639-6. Mathematically, the upper limit for the number of languages and dialects that can be so represented is $26^4=456,976$.

See also

★ list of ISO 639-1 codes

★ list of ISO 639-2 codes

★ list of ISO 639-3 codes

★ language code

★ language families and languages

★ list of languages

★ list of official languages

★ ISO 3166 (codes for countries)

★ ISO 15924 (codes for writing systems)

★ IETF language tags (based on ISO 639)

External links

★ ISO 639-2 Registration Authority

★ XML version of the official ISO 639-2 HTML data from the Library of Congress

★ ISO 639-3 Registration Authority

★ ISO 639 and the Ethnologue

★ Language codes in English and Italian with Perl scripts for parsing and PHP code

★ British Standards Institute