šīn
Shin (also spelled Šin (šīn) or Sheen) literally means "tooth", "press", and "sharp"; It is the twenty-first letter of the Semitic abjads, including Phoenician Shin Phoenician sin.svg, Hebrew Shin ש, Aramaic Shin Shin.svg, Syriac Shin ܫ, and Arabic Shin ش (in abjadi order, 13th in modern order). Its sound value is a voiceless sibilant, [ʃ] or [s].
The Phoenician letter gave rise to the Greek Sigma (Σ) (which in turn gave Latin S and Cyrillic С), and the letter Sha in the Glagolitic and Cyrillic scripts (Glagolitic sha.svg, Ш).
The South Arabian and Ethiopian letter Śawt is also cognate.
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