This page is about the meaning, origin and characteristic of the symbol, emblem, seal, sign, logo or flag: Sigma.
Sigma is the eighteenth letter of the Greek alphabet. In the system of Greek numerals, it has a value of 200. When used at the end of a word (when the word is not all caps), the final form (ς) is used, e.g. Ὀδυσσεύς (Odysseus); note the two sigmas in the center of the name, and the word-final sigma at the end.
The name of sigma, according to one hypothesis, may continue that of Phoenician Samekh. According to a different theory, its original name may have been san (the name today associated with another, obsolete letter), while sigma was a Greek innovation that simply meant "hissing", based on a nominalization of a verb σί
Asymmetric, Open shape, Monochrome, Contains both straight and curved lines, Has no crossing lines.
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