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
Greek Braille ά, Ά, αί. It's not used for diaeresis; ϊ is just . Digits are the same as in English Braille. Arithmetical symbols are: International letter assignments differ somewhat from those above. In Modern Greek Braille, for example, the letter omega (ω) is written the same as Latin "j", whereas in English or French braille texts it is written as a "w", which it resembles in print. Similarly, Modern Greek upsilon is written as Latin "y", but in international Greek it's written as "u", and the letter eta is inverted. This alphabet is used, for example, in mathematical notation in an