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Sigma (/ ˈ s ɪ ɡ m ə / SIG-mə; [1] uppercase Σ, lowercase σ, lowercase in word-final position ς; Ancient Greek: σίγμα) is the eighteenth letter of the Greek alphabet.In the system of Greek numerals, it has a value of 200.
The Book of Signs: which contains all manner of symbols used from the earliest times to the Middle Ages by primitive peoples and early Christians. New York. ISBN 0-486-20162-7. {}: CS1 maint: location missing publisher
He used critical and exegetical signs in his editions of the Homeric poems. A 'dotted lunate sigma' (σίγμα περιεστιγμένον) Ͼ was used by him as an editorial sign indicating that the line so-marked is at an incorrect position in the surrounding text; an antisigma, or 'reversed lunate sigma' Ͻ, may also mark an out of place line.
Sigma baryon; represents: Stefan–Boltzmann constant in blackbody radiation; the divisor function in number theory; the real part of the complex variable = + in analytic number theory; the sign of a permutation in the theory of finite groups
unstrict inequality signs (less-than or equals to sign and greater-than or equals to sign) 1670 (with the horizontal bar over the inequality sign, rather than below it) John Wallis: 1734 (with double horizontal bar below the inequality sign) Pierre Bouguer
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).