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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 uppercase and lowercase forms of the 24 letters are: ... capital sigma (Σ) for summation, and lower case sigma (σ) for standard deviation.
(uppercase) represents: an asymptotically tight bound related to big O notation. sensitivity to the passage of time in mathematical finance; in set theory, a certain ordinal number; Heaviside step function (lowercase) represents: a plane angle in geometry
Historically, upper-case letters were used for representing points in geometry, and lower-case letters were used for variables and constants. Letters are used for representing many other types of mathematical object. As the number of these types has increased, the Greek alphabet and some Hebrew letters have also come to be used.
Its lowercase form ʃ is similar to an integral sign ∫ or a long s ſ with an extra leftward hook at the bottom; in 1928 the Africa Alphabet borrowed the Greek letter sigma for the uppercase form Ʃ .
Uppercase and lowercase Greek letter sigma, from the times.ttf font included with standard XOrg X Windows installations. Intended to replace Image:Sigma.png.
In uppercase (all-caps), accents and breathings are eliminated, in titlecase they appear to the left of the letter rather than above it. Unlike other diacritics, the dieresis is kept above letters also in uppercase. Different conventions exist for the handling of the iota subscript. Diacritics can be found above capital letters in medieval ...
English: uppercase Greek letter sigma. Times New Roman font. Date: 21 March 2006: Source: Own work: Author: F l a n k e r: Permission (Reusing this file)