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Written by Oleksandr Gavenko (AKA gavenkoa), compiled on 2017-01-30 from rev ccaa2f364422+.

Standards for codes

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:

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.