S is the nineteenth letter in the modern Latin alphabet. Its name in English is spelled ess or occasionally es (pronounced /ɛs/), generally es- when part of a compound word, plural esses.

Semitic Šîn ("teeth") represented a voiceless postalveolar fricative /ʃ/ (as in ship). Greek did not have this sound, so the Greek sigma (Σ) came to represent /s/. The name "sigma" probably comes from the Arabic word "samak" (fish; spine) and not "Šîn". In Etruscan and Latin, the [s] value was maintained, and only in modern languages has the letter been used to represent other sounds, such as voiceless postalveolar fricative [ʃ] in Hungarian and German (before p, t) or the voiced alveolar fricative [z] in English, French and German.

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