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sigma ,
Sigma ,
Σ ,
σ , or
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Sigma (Σ or σ , word-final lowercase ς ) is the 18th letter of the Greek alphabet.
Sigma may also refer to:
Companies and organizations
Sigma AB , a Swedish IT consultancy company
Sigma Alimentos , multinational food processing and distribution company
Sigma Corporation , a Japanese camera and lens manufacturer
Sigma Designs , Inc., a US semiconductor manufacturer
Sigma Healthcare , an Australian pharmaceutical company
Sigma Motor Corporation , a defunct South African motor vehicle assembler and manufacturer
Sigma Motors , a Pakistani assembler of Land Rovers
Sigma Sigma Sigma (Tri-Sigma), an American women's sorority centered on education & scholarship
Sigma Sport , a German manufacturer of electronic sports equipment
Sigma TV , a television channel in Cyprus
Sigma (operations research) , a company founded in the UK in 1961
SIGMA (verification service) , Nielsen Media Research's tracking system for videos
Sigma-Aldrich , an American chemical company
Telkomsigma or Sigma Cipta Caraka, an Indonesian IT company
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
σ,
sigma bond in chemistry
σ,
sigma factor of RNA polymerase in biology
σ,
Stefan–Boltzmann constant of radiation in physics
σ,
stress (mechanics) , the force per unit area applied by internal forces of a material
σ, the electronic substituent constant for activation of substituted arenes in the
Hammett equation
σ, a measure of a material's
electrical conductivity ability
Cross section σ in physics
Pauli matrices in quantum physics
Sigma baryon in particle physics
Sigma receptor , a neural receptor
Surface charge density in classical electromagnetism
Sigma , a Greek letter used in
Bayer designations for
naming stars , in astronomy. Notable examples include:
Sport
Video games
Other
See also
Topics referred to by the same term