Sigma is a letter of the Greek alphabet.

Sigma may also refer to:

Companies and organizations

Films and television

  • Ood Sigma, a fictional character from the Doctor Who series
  • Space City Sigma, a 1980s Indian science fiction TV series
  • Sigma, a fictional character from the anime Tweeny Witches
  • Sigma Society, a fictional Mensa-type club, appearing in the third episode of Columbo sixth season
  • Sigma, a fictional character from the Bungo Stray Dogs manga and anime series

Mathematics

Music

Places

Products

Science

Sport

Video games

Other

See also

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