--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/codes.rst	Thu Aug 25 17:21:49 2016 +0300
@@ -0,0 +1,44 @@
+.. -*- coding: utf-8; -*-
+
+=====================
+ Standards for codes
+=====================
+.. contents::
+   :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.
+