History of the Greek alphabet only required one. The history here is complicated, but basically "sāmekh" dropped out in certain dialects, and was reused to represent in others, while usage for the sound varied between "ṣādē" and "šin". The letter now known as sigma took its name from "sāmekh" but its form from "šin", while the letter San, which occurred in a few dialects only, took its name from "šin" but its place in the alphabet from "ṣādē". A further Greek letter of uncertain origin, sampi, is found occasionally, and may represent an affricate, such as . For the special case of zeta, see Zeta
Waw (letter) Waw (letter) Waw/Vav ( "hook") is the sixth letter of the Semitic abjads, including Phoenician "wāw" , Aramaic "waw" , Hebrew "vav" , Syriac "waw" ܘ and Arabic "wāw" (sixth in abjadi order; 27th in modern Arabic order). It represents the consonant (in original Hebrew ), (and [v] in modern Hebrew) if there is a dot in front of or above the vav, it represents the vowels or . It is the origin of Greek Ϝ (digamma) and Υ (upsilon), Latin F and V, and the derived "Latin"- or "Roman"- alphabet letters U, W, and Y. The letter likely originated