Shin is the twenty-first letter of the Semitic abjads, including Phoenician šīn 𐤔, Hebrew šīn ש, Aramaic šīn 𐡔, Syriac šīn ܫ, and Arabic sīn س. Its sound value is a voiceless sibilant, or.
The Phoenician letter gave rise to the Greek Sigma, and... Wikipedia