Shin (letter) languages, as follows: In the Arabic alphabet, ' is at the original (21st) position in Abjadi order. A letter variant ' takes the place of Samekh at 15th position. "" represents , and is the 13th letter of the modern alphabet order and is written thus: The Arabic letter "šīn" was an acronym for "something" ( "šayʾ(un)" ) meaning the unknown in algebraic equations. In the transcription into Spanish, the Greek letter "chi" (χ) was used which was later transcribed into Latin "x". According to some sources, this is the origin of "x" used for the unknown in the equations.
V V V (named "vee" ) is the 22nd letter in the modern English alphabet and the ISO basic Latin alphabet. The letter V comes from the Semitic letter "Waw", as do the modern letters F, U, W, and Y. See F for details. In Greek, the letter "upsilon" 'Υ' was adapted from "waw" to represent, at first, the vowel as in "moon". This was later fronted to , the front rounded vowel spelled 'ü' in German. In Latin, a stemless variant shape of the upsilon was borrowed in early times as V—either directly from the Western Greek alphabet or from