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'{{wiktionary|sigma|Sigma|Σ|σ|ς}} '''[[Sigma]]''' ({{lang|grc|Σ}} or {{lang|grc|σ}}, word-final lowercase {{lang|grc|ς}}) is the 18th letter of the Greek alphabet. '''Sigma''' may also refer to: {{TOC right}} Slang: Sigma. “Omg, im so sigma skibidi rizz god!” == 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 (season 6)|Columbo sixth season]]'' * Sigma, a fictional character from the ''[[Bungo Stray Dogs]]'' manga and anime series == Mathematics == * [[Summation]] operator forming a series in mathematics Σ * [[Standard deviation]] in statistics σ * [[Divisor function]] in number theory σ * [[Sigma-algebra]] (σ-algebra, σ-field) in set theory * A [[busy beaver]] function in computability theory Σ * <math>\Sigma^0_n</math> or <math>\Sigma^1_n</math>, sets in the [[analytical hierarchy]] * <math>\Sigma^P_i</math>, a set in the [[polynomial hierarchy]] * [[Harish-Chandra's σ function]] * [[Weierstrass sigma function]] * [[Sigma additivity]] ==Music== * [[Sigma (album)|''Sigma'' (album)]] * [[Sigma (DJs)]], a British drum and bass duo * [[Sigma AZ (band)]], punk rock band from Phoenix, Arizona ==Places== * [[Sigma, Capiz]], a municipality in the Philippines * [[Sigma, Lee County, Virginia]], United States * [[Sığma, Sarayköy]] * The [[Sigma Plan]], to raise the dikes of the [[Scheldt]] River in Belgium == Products == * [[GM Sigma platform]], an automobile platform * [[Mitsubishi Sigma]] * [[SDS Sigma series]] of computers from Scientific Data Systems * [[Sigma (sailplane)]] * [[Sigma Guitars]] * [[Six Sigma]] quality management program * [[Smith & Wesson Sigma]], a firearm == 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 (physics)|Cross section]] σ in physics * [[Pauli matrices]] in quantum physics * [[Sigma baryon]] in particle physics * [[Sigma receptor]], a neural receptor * [[Charge density|Surface charge density]] in classical electromagnetism * [[Sigma]], a Greek letter used in [[Bayer designation]]s for [[naming stars]], in astronomy. Notable examples include: ** [[Sigma Canis Majoris]] ** [[Sigma Draconis]] ** [[Sigma Octantis]] ** [[Sigma Orionis]] ==Sport== * [[Sigma FC]], a Canadian soccer team * [[SK Sigma Olomouc]], a Czech association football team * [[Histor–Sigma]], a Belgian professional cycling team known as Sigma in 1986 == Video games == * [[Sigma (Mega Man X)|Sigma (''Mega Man X'')]], the villain of the ''Mega Man X'' series * [[Sigma (Overwatch)|Sigma (''Overwatch'')]], a hero from ''[[Characters of Overwatch#Sigma|Overwatch]]'' * ''[[Ninja Gaiden Sigma]]'', a video game * Sigma, a character in the ''[[BioShock 2]]'' video game universe * ''[[Sigma Harmonics]]'', a video game * Sigma Klim, a major character and protagonist in the [[Zero Escape]] video game series * Sigma, a team on the ''[[Dota 2]]'' online video game == Other == * [[Advance Sigma]], a Swiss paraglider design * [[Sigma (couch)]], used in ancient Roman banquets * [[Sigma class corvette]], a naval ship * [[Sigma male]], slang term for masculine men ==See also== * [[Sygma (disambiguation)]] {{disambig}}'