Sigma

Sigma may refer to many things:

  • 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 Sigma factor of RNA polymerase in biology.
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