He has only one symbol (written somewhat like a final sigma) for an unknown quantity, which he calls apc0µ6s (defined as "an undefined number of units"); the symbol may be a contraction of the initial letters ap, as A Y, K Y, D Y O, &c., are for the powers of the unknown (Suvaµcs, square; icu(30s, cube; Svva,uo& va i ccs, fourth power, &c.).
In the Phoenician alphabet it takes a form closely resembling the English W, and this when moved through an angle of 90 is the ordinary Greek sigma 2.
The Semitic name of the symbol is shin; the Greek name sigma may mean merely the hissing letter and may be a genuine Greek derivative from the verb o-4co, hiss.
139), called that letter san which the Ionian Greeks called sigma; san seems more likely to be an attempt to reproduce the Semitic name.
The confusion is thus extreme: the name Zade assimilated in Greek to the names ajra and B41ra becomes slira, though the form is that of Zain; the name of Samech is possibly the origin of Sigma, while the form of Samech is that of = which has not taken over a Phoenician name.