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Uppercase and lowercase Greek letter sigma, from the times.ttf font included with standard XOrg X Windows installations. Intended to replace Image:Sigma.png . Category:Greek letters
The font was created by Adobe and has its own character encoding, with the Greek letters arranged according to similar Latin letters (Chi = C, etc.).The document describing the mapping to Unicode code points [2] was created before several of the characters were added to Unicode, so the original mapping assigns several of the characters to the Private Use Area (PUA).
Today, it is known as lunate sigma (uppercase Ϲ, lowercase ϲ), because of its crescent-like shape, and is still widely used in decorative typefaces in Greece, especially in religious and church contexts, as well as in some modern print editions of classical Greek texts.
As of Unicode version 16.0, there are 155,063 characters with code points, covering 168 modern and historical scripts, as well as multiple symbol sets.This article includes the 1,062 characters in the Multilingual European Character Set 2 subset, and some additional related characters.
Typographical symbols and punctuation marks are marks and symbols used in typography with a variety of purposes such as to help with legibility and accessibility, or to identify special cases. This list gives those most commonly encountered with Latin script. For a far more comprehensive list of symbols and signs, see List of Unicode characters.
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Greek letters are used in mathematics, science, engineering, and other areas where mathematical notation is used as symbols for constants, special functions, and also conventionally for variables representing certain quantities. In these contexts, the capital letters and the small letters represent distinct and unrelated entities.
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