- Sigma (upper case Σ, lower case σ, alternative ς) is a 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.
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