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It defines three sets of country codes: [1] ISO 3166-1 alpha-2 – two-letter country codes which are used most prominently for the Internet's country code top-level domains (with a few exceptions). ISO 3166-1 alpha-3 – three-letter country codes which allow a better visual association between the codes and the country names than the alpha-2 ...
The exact phrase three-letter acronym appeared in the sociology literature in 1975. [1] Three-letter acronyms were used as mnemonics in biological sciences, from 1977 [2] and their practical advantage was promoted by Weber in 1982. [3] They are used in many other fields, but the term TLA is particularly associated with computing. [4]
ISO 3166-1 alpha-2 – two-letter country codes which are also used to create the ISO 3166-2 country subdivision codes and the Internet country code top-level domains. ISO 3166-1 alpha-3 – three-letter country codes which may allow a better visual association between the codes and the country names than the 3166-1 alpha-2 codes.
Highlighted rows indicate those entries in which the three-letter codes differ from column to column. The last column indicates the number of codes present followed by letters to indicate which codes are present (O for Olympic, F for FIFA, and I for ISO) and dashes when a code is absent; capital letters indicate codes which match; lower case ...
The ninth edition's ratification draft was published on 6 July 2005, with a reply deadline of 6 October 2005. It replaces all two- and four-letter codes with ISO or ISO-like three- and six-letter codes. It is intended as a transitional standard: once all NATO nations have updated their information systems, a tenth edition will be published.
Countries or areas, codes and abbreviations – list of alpha-3 and numeric codes (a few territories officially assigned codes in ISO 3166-1 are not included in this list) The World Factbook (public domain), Central Intelligence Agency Appendix D – Country Data Codes – comparison of FIPS 10, ISO 3166, and STANAG 1059 country codes
FIFA assigns a three-letter country code (more properly termed a trigram or trigraph [1]) to each of its member and non-member countries.These are the official codes used by FIFA and its continental confederations (AFC, CAF, CONCACAF, CONMEBOL, OFC and UEFA) as name abbreviations of countries and dependent areas, in official competitions.
The traditional abbreviations for U.S. states and territories, widely used in mailing addresses prior to the introduction of two-letter U.S. postal abbreviations, are still commonly used for other purposes (such as legal citation), and are still recognized (though discouraged) by the Postal Service.