Samekh or Simketh is the fifteenth letter of many Semitic abjads, including Phoenician Ṣāmek Phoenician samekh.svg, Hebrew ˈSamekh ס, Aramaic Semkath Samekh.svg, Syriac Semkaṯ ܣ, representing /s/. The Arabic alphabet, however, uses a letter based on Phoenician Šīn to represent /s/ (see there); however, that glyph takes Samekh's place in the traditional Abjadi order of the Arabic alphabet.
The Phoenician letter gave rise to the Greek Xi (Ξ, ξ).
© Symbols.com