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  2. ISO 3166-1 - Wikipedia

    en.wikipedia.org/wiki/ISO_3166-1

    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 codes.

  3. List of ISO 639 language codes - Wikipedia

    en.wikipedia.org/wiki/List_of_ISO_639_language_codes

    Each language is assigned a two-letter (set 1) and three-letter lowercase abbreviation (sets 2–5). [2] Part 1 of the standard, ISO 639-1 defines the two-letter codes, and Part 3 (2007), ISO 639-3 , defines the three-letter codes, aiming to cover all known natural languages , largely superseding the ISO 639-2 three-letter code standard.

  4. List of Unicode characters - Wikipedia

    en.wikipedia.org/wiki/List_of_Unicode_characters

    A numeric character reference refers to a character by its Universal Character Set/Unicode code point, and a character entity reference refers to a character by a predefined name. A numeric character reference uses the format &#nnnn; or &#xhhhh; where nnnn is the code point in decimal form, and hhhh is the code point in hexadecimal form.

  5. Language code - Wikipedia

    en.wikipedia.org/wiki/Language_code

    en-US – English as used in the United States (US is the ISO 3166‑1 country code for the United States) [2] es – Spanish, as shortest ISO 639 code. es-419 – Spanish appropriate for the Latin America and Caribbean region, using the UN M.49 region code; ISO 639‑1: Two-letter code system made official in 2002, containing 136 codes at the ...

  6. List of ISO 639-2 codes - Wikipedia

    en.wikipedia.org/wiki/List_of_ISO_639-2_codes

    Where two ISO 639-2 codes are given in the table, the one with the asterisk is the bibliographic code (B code) and the other is the terminological code (T code). Entries in the Scope column distinguish: individual language; collections of languages connected, for example genetically or by region; macrolanguages. The Type column distinguishes:

  7. Lists of country codes - Wikipedia

    en.wikipedia.org/wiki/Lists_of_country_codes

    This is a listing of lists of country codes: List of ISO country codes (ISO 3166) ITU country code (International Telecommunication Union) List of country calling codes E.164; Mobile country code E.212; Maritime identification digits; List of ITU letter codes (radiocommunication division) UIC country code (International Union of Railways)

  8. BCD (character encoding) - Wikipedia

    en.wikipedia.org/wiki/BCD_(character_encoding)

    In "Spanish speaking countries", the character "Ñ" did not exist in the original system, therefore "@" was chosen by most manufacturers: Bull, NCR, and Control Data, but there was an inconsistency when merging databases to 7-bit ASCII code, for in that coding system the "/" character was chosen, resulting in two different codes for the same ...

  9. IETF language tag - Wikipedia

    en.wikipedia.org/wiki/IETF_language_tag

    An IETF BCP 47 language tag is a standardized code that is used to identify human languages on the Internet. [1] The tag structure has been standardized by the Internet Engineering Task Force (IETF) [1] in Best Current Practice (BCP) 47; [1] the subtags are maintained by the IANA Language Subtag Registry.