Semitic Š? (bow) was pronounced as /S/ as the modern English digraph SH. In Greek, there was only one phoneme /s/ and no /S/, so Greek σιγμα (sigma) came to represent the Greek /s/ phoneme. The name "sigma" probably comes from the Semitic letter "S?ek" and not "Š?". In Etruscan and Latin, the /s/ value was maintained, and only in modern languages, S came to represent other sounds, like /S/ in Hungarian or /z/ in English, French and German (in English rise; in French lisez, "read! (imperative pl.)"; in German lesen "to read").
An archaic alternative form of s, ſ, called the long s or medial s, was used at the beginning or in the middle of the word; the modern form, the short or terminal s, was used at the end of the word. The ligature of ſs became the German A, B, C, D, E, F, G, H, I, J, K, L, M, N, O, P, Q, R, S, T, U, V, W, X, Y, Z
Sierra represents the letter S in the NATO phonetic alphabet.
S is also:
Two-letter combinations starting with S:
See also: ß, ſ, Š, Ŝ, Ş