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'San' (uppercase , lowercase ) was a letter of the
Greek alphabet, appearing between
Pi and
Qoppa in alphabetical order, corresponding in position to the
Phoenician Tsade , but its name comes from
Shin. It usually had a phonemic value of , but eventually became disused in favour of
sigma. The latest attested use is in the
6th century BC. With a somewhat different shape (which has been labelled "Tsan"
[1]) the letter was also used in
Arcado-Cypriot as , replacing a previous
labio-velar before a front vowel, where other dialects replaced it with
Tau.
The Phoenician or the Greek letter was loaned into the
Old Italic alphabets (, transcribed as Åš), in the archaic Etruscan alphabet retaining its M-shape but from the 6th century BC changing its aspect to a shape similar to that of the
d-rune 
D
.
Computer encoding
| Appearance | Code points | Name |
|---|
| | U+03FA | GREEK CAPITAL LETTER SAN |
| | U+03FB | GREEK SMALL LETTER SAN |
The Tsan variant has a glyph identical to the
Pamphylian Greek digamma, U+0376 U+0377, which is scheduled for inclusion in
Unicode 5.1.
References
1. History and representation of Tsan