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 Standards for codes
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   :local:

Currency codes
==============

ISO 4217 defines codes with 3 latin letters.

http://www.currency-iso.org/en/home/tables/table-a1.html
  Official list of currency codes.
https://en.wikipedia.org/wiki/ISO_4217
  Wikipedia article.

Country codes
=============

ISO 3166-1 defines 2 letter and 3 letter codes:

* A two-letter (ISO 3166-1 alpha-2).
* A three-letter (ISO 3166-1 alpha-3).
* A three-digit numeric (ISO 3166-1 numeric) code.

http://www.iso.org/iso/country_codes.htm
  Official page.
https://en.wikipedia.org/wiki/ISO_3166-1
  Wikipedia article.
https://en.wikipedia.org/wiki/Country_code
  Wikipedia article.

Language codes
==============

ISO 639 defines several 2 and 3 letter codes for languages.

https://en.wikipedia.org/wiki/ISO_639
  Wikipedia article.
https://en.wikipedia.org/wiki/List_of_ISO_639-1_codes
  Wikipedia article.