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  2. List of ISO 639 language codes - Wikipedia

    en.wikipedia.org/wiki/List_of_ISO_639_language_codes

    This table lists all two-letter codes (set 1), one per language for ISO 639 macrolanguage, and some of the three-letter codes of the other sets, formerly parts 2 and 3. Entries in the Scope column distinguish: Individual language; Collections of related languages; Macrolanguages; The Type column distinguishes: Ancient languages (extinct since ...

  3. Morse code - Wikipedia

    en.wikipedia.org/wiki/Morse_code

    Chart of the Morse code 26 letters and 10 numerals [1]. This Morse key was originally used by Gotthard railway, later by a shortwave radio amateur [2]. Morse code is a telecommunications method which encodes text characters as standardized sequences of two different signal durations, called dots and dashes, or dits and dahs.

  4. Closure operator - Wikipedia

    en.wikipedia.org/wiki/Closure_operator

    Convex hull (red) of a polygon (yellow). The usual set closure from topology is a closure operator. Other examples include the linear span of a subset of a vector space, the convex hull or affine hull of a subset of a vector space or the lower semicontinuous hull ¯ of a function : {}, where is e.g. a normed space, defined implicitly ⁡ (¯) = ⁡ ¯, where ⁡ is the epigraph of a function .

  5. Identity Digital - Wikipedia

    en.wikipedia.org/wiki/Identity_Digital

    The company acquired the registry operator and back-end registry services divisions of Afilias, Inc. in 2020. Both Donuts Inc. (the parent company) and Afilias Inc . were rebranded and brought under the single company brand name Identity Digital in 2022.

  6. List of IOC country codes - Wikipedia

    en.wikipedia.org/wiki/List_of_IOC_country_codes

    The code former GUI has been reassigned to Guinea (GUI) in 1965 when its new NOC was recognized by the IOC and used publicly in their first competed games in 1968. All formerly known by BGU [ 1 ] HBR

  7. List of airline codes (R) - Wikipedia

    en.wikipedia.org/wiki/List_of_airline_codes_(R)

    Airline Designator / Code Database Search Archived 2005-10-01 at the Wayback Machine (from The Airline Codes Web Site) Airline Designator / Code Database Search ...

  8. Police code - Wikipedia

    en.wikipedia.org/wiki/Police_code

    The Hundred Code is a three-digit police code system. [3] This code is usually pronounced digit-by-digit, using a radio alphabet for any letters, as 505 "five zero five" or 207A "two zero seven Alpha".

  9. Reduction operator - Wikipedia

    en.wikipedia.org/wiki/Reduction_Operator

    In computer science, the reduction operator [1] is a type of operator that is commonly used in parallel programming to reduce the elements of an array into a single result. Reduction operators are associative and often (but not necessarily) commutative .