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A value-added tax identification number or VAT identification number ( VATIN [1]) is an identifier used in many countries, including the countries of the European Union, for value-added tax purposes. In the EU, a VAT identification number can be verified online at the EU's official VIES [2] website. It confirms that the number is currently ...
ISO 639 is a standardized nomenclature used to classify languages. Each language is assigned a two-letter (set 1) and three-letter lowercase abbreviation (sets 2–5). 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.
In writing and typography, a ligature occurs where two or more graphemes or letters are joined to form a single glyph. Examples are the characters æ and œ used in English and French, in which the letters a and e are joined for the first ligature and the letters o and e are joined for the second ligature.
Greek letters were also used to write numbers. In the classical Ionian system, the first nine letters of the alphabet stood for the numbers from 1 to 9, the next nine letters stood for the multiples of 10, from 10 to 90, and the next nine letters stood for the multiples of 100, from 100 to 900.
ABA routing transit number. In the United States, an ABA routing transit number ( ABA RTN) is a nine-digit code printed on the bottom of checks to identify the financial institution on which it was drawn. The American Bankers Association (ABA) developed the system in 1910 [1] to facilitate the sorting, bundling, and delivering of paper checks ...
Format. The format of the number is two prefix letters, six digits and one suffix letter. An example given at the source is QQ123456C, although that is an invalid entry according to the definition. Neither of the first two letters can be D, F, I, Q, U or V. The second letter also cannot be O.
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Two-letter country codes. Two-letter country codes are used to represent countries and states (often both widely recognized and not) as a code of two letters. ISO 3166-1 alpha-2 is the main set of two-letter country codes that is currently used. This standard set of codes is a part of ISO 3166-1, also maintains a list of three-letter codes for ...