language code human language, standard
A set of standard names and abbreviations maintained by ISO for identifying human languages, natural and invented, past and present. Each language has a list of English and French names and an ISO 639-2 three-letter code. Some also have an ISO 639-1 two-letter code.
The list even includes the Klingon language from the Star Trek science fiction series.
Latest list.
There are also country codes.
(2006-12-11)