San (letter) San (letter) San (Ϻ) was an archaic letter of the Greek alphabet. Its shape was similar to modern M, or ϡ, or to a modern Greek Sigma (Σ) turned sideways, and it was used as an alternative to Sigma to denote the sound . Unlike Sigma, whose position in the alphabet is between Rho and Tau, San appeared between Pi and Qoppa in alphabetic order. In addition to denoting this separate archaic character, the name "San" was also used as an alternative name to denote the standard letter Sigma. The existence of the two competing letters Sigma and San is
San (letter) an acute accent) or by ⟨σ̱⟩ (sigma with a macron underneath). Note, however, that the same symbol is used to denote the unrelated letter waw () in Pamphylia (the "Pamphylian digamma") and was also the form of beta () used in Melos. The Ionian letter , which later gave rise to the numeral symbol Sampi (ϡ = 900) may also be a continuation of San, although it did not have the same alphabetic position. In the Greek script used for writing the Bactrian language, there existed a letter resembling a ""þ"", which apparently stood for the sound (transliterated as "š")