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Sigma as a letter in the Greek alphabet (Σ, σ, or ς) may refer to many things:
- Upper-case letter Σ is used as a symbol for
- the summation operator forming a series in mathematics.
- 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 divisor function in number theory.
- the Stefan-Boltzmann constant of radiation in physics.
- the Sigma factor of RNA polymerase in biology.
Sigma can also refer to:
- a classification of quantum particle—see baryon.
- cell receptors in biochemistry and pharmacology.
- the name (Sigma) of the main villain from the video game series Mega Man X.
- a manufacturer (Sigma Corporation) of cameras, lenses and camera accessories.
- Sigma Designs, a company manufacturing ASICs for digital video appliances.
- a model of handgun manufactured by Smith and Wesson.
- a series of sailing yachts.
- the Mitsubishi Sigma, a variant of the Mitsubishi Galant.
- SIGMA (verification service), Nielsen Media Research's tracking system that allows Nielsen to electrionically monitor airplay of videos.
- the name of an insurance company active in Albania.
- Sigma, Capiz, a municipality in the Philippines.
- Sigma refers informally to the degree of exceptionality of a person or thing.
- Six Sigma is a quality management program; the name refers to six standard deviations.
As an acronym SIGMA can stand for the Society of Independent Gasoline Marketers of America.
Ancient Greece
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Medieval Greece / Byzantine Empire
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Modern Greece
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