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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. In general mathematics, uppercase Σ is used as an operator for summation.
the standardized regression coefficient for predictor or independent variables in linear regression (unstandardized regression coefficients are represented with the lower-case Latin b, but are often called "betas" as well) the ratio of collector current to base current in a bipolar junction transistor (BJT) in electronics (current gain)
Sigma with caron: Nonstandard letter for Cypriot Greek [9] and Pontic Greek [10] representing /ʃ/ Σ̈σ̈: Sigma with diaeresis: Arvanitika letter for /ʃ/ [7] Τ̌τ̌: Tau with caron: Nonstandard letter for Cypriot Greek representing /c/ [9] Ύύ: Upsilon with acute: High pitch on short vowel or rising pitch on long vowel Ὺὺ: Upsilon ...
The uppercase and lowercase forms of the 24 letters are: Α α, Β β, Γ γ, Δ δ, Ε ε, Ζ ζ, Η η, Θ θ, Ι ι, Κ κ, Λ λ, Μ μ, Ν ν, Ξ ξ, Ο ο, Π π, Ρ ρ, Σ σ ς, Τ τ, Υ υ, Φ φ, Χ χ, Ψ ψ, Ω ω. The Greek alphabet is the ancestor of several scripts, such as the Latin, Gothic, Coptic, and Cyrillic scripts. [8]
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 sorts of mathematical objects. As the number of these sorts has remarkably increased in modern mathematics, the Greek alphabet and some Hebrew letters are also ...
Stigma was co-opted as a name specifically for the στ sign, evidently because of the acrophonic value of its initial st-as well as the analogy with the name of sigma. The numeral symbol, originally quite unrelated to the στ ligature, developed from the letter Ϝ , which stood for the sound /w/ in early pre-classical forms of the Greek alphabet.
Sigma , the villain of the Mega Man X series; Sigma , a hero from Overwatch; Ninja Gaiden Sigma, a video game; Sigma, a character in the BioShock 2 video game universe; Sigma Harmonics, a video game; Sigma Klim, a major character and protagonist in the Zero Escape video game series; Sigma, a team on the Dota 2 online video game
Uppercase and lowercase Greek letter sigma, from the times.ttf font included with standard XOrg X Windows installations. Intended to replace Image:Sigma.png.