The last letter of the Greek alphabet is Omega. Which other letter, the 15th, also begins with the letter 'O'?
Omega Omega Omega (capital: Ω, lowercase: ω; Greek ὦ, later ὦ μέγα, Modern Greek ωμέγα) is the 24th and last letter of the Greek alphabet. In the Greek numeric system/Isopsephy (Gematria), it has a value of 800. The word literally means "great O" ("ō mega", mega meaning "great"), as opposed to omicron, which means "little O" ("o mikron", micron meaning "little"). In phonetic terms, the Ancient Greek Ω is a long open-mid "o" , comparable to the vowel of British English "raw". In Modern Greek, Ω represents the , the same sound as omicron. The letter omega is transcribed "ō" or
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.