This category consist of templates which return the ISO 639 name of a language based primarily on the [[ISO 639-1]], [[ISO 639-2]] or [[ISO 639-3]] codes for the language. They are used in template {{tl|Lang}} (which in turn is used by many other templates) to categorise articles which contain text in non-English languages.
*ISO 639-1 Example: {{Tl|ISO 639 name fr}} -> French
*ISO 639-2 Example: {{Tl|ISO 639 name fra}} -> French
*ISO 639-3 Example: {{Tl|ISO 639 name fre}} -> French
Other "codes" can be used at the discretion of the maintainers of the templates: For example zh-t for traditional Chinese, or allowing full names to translate to themselves (e.g. French -> French)