Samekh or Simketh is the fifteenth letter in many Semitic alphabets, including Phoenician, Hebrew, and Aramaic, representing /s/. The Arabic alphabet, however, uses a letter based on Phoenician šin 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).