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• Sigma (upper case Σ, lower case σ, alternative ς) is a letter in the Greek alphabet. See Sigma (letter).

• The upper-case letter Σ is used as a symbol for the summation operator forming a series in mathematics.

• The upper-case letter Σ is used as a symbol for a certain alphabet of a language, or of some other object dependent on an alphabet; expressed in mathematical terms, eg "the language defined by alphabet Σ={a,b,c} and the rules ..."

• The lower-case letter σ is used as a symbol for the standard deviation of a population in statistics.

• The lower-case letter σ is used as a symbol for the divisor function in number theory.

• The lower-case letter σ is used as a symbol for the Stefan-Boltzmann constant of radiation in physics.

• sigma₁ and sigma₂ are cell receptors in biochemistry and pharmacology.

• The name of the main villain from the video game series Mega Man X.

• The lower-case letter σ is used as a symbol for the Sigma factor of RNA polymerase in biologyBiology studies the variety of life clockwise from top-left E. coli tree fern, gazelle, Goliath beetle Biology is the science of life. It is concerned with the characteristics and behaviors of organisms, how species and individuals come into existence, an.

• Sigma CorporationSigma Corporation manufacture cameras, lenses, flashes and other photographic accessories. As well as making lenses to fit their own cameras, Sigma lenses are made to fit the interchangeable lens cameras of the leading camera manufacturers, usually Canon, is a manufacturer of cameras, lenses and camera accessories.