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Based on pitch levels sounded with their solfege syllables (a "musical language") although no knowledge of music is required to learn it. Communicationssprache. 1839. Joseph Schipfer. Based on French. Universalglot. 1868. Jean Pirro. An early a posteriori language, predating even Volapük.
The pigpen cipher (alternatively referred to as the masonic cipher, Freemason's cipher, Rosicrucian cipher, Napoleon cipher, and tic-tac-toe cipher) [2] [3] is a geometric simple substitution cipher, which exchanges letters for symbols which are fragments of a grid. The example key shows one way the letters can be assigned to the grid.
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.
A telegraph code is one of the character encodings used to transmit information by telegraphy. Morse code is the best-known such code. Telegraphy usually refers to the electrical telegraph, but telegraph systems using the optical telegraph were in use before that. A code consists of a number of code points, each corresponding to a letter of the ...
List of ISO 639-3 codes. These are lists of ISO 639-3 language codes . Enter an ISO 639-3 language code to find the corresponding article.
ISO 639-1:2002, Codes for the representation of names of languages—Part 1: Alpha-2 code, is the first part of the ISO 639 series of international standards for language codes. Part 1 covers the registration of "set 1" two-letter codes. There are 183 two-letter codes registered as of June 2021. The registered codes cover the world's major ...
Comprehensive lists. Lists which are global in scope (all living natural languages would classify for inclusion): by primary language family: List of Afro-Asiatic languages, List of Austronesian languages, List of Indo-European languages, List of Mongolic languages, List of Tungusic languages, List of Turkic languages, List of Uralic languages.
All of the right-angled triangles are similar, i.e. the ratios between their corresponding sides are the same. For sin, cos and tan the unit-length radius forms the hypotenuse of the triangle that defines them. The reciprocal identities arise as ratios of sides in the triangles where this unit line is no longer the hypotenuse.