Sigma (disambiguation)
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Look up sigma in Wiktionary, the free dictionary. |
Sigma (Σ,σ) is a letter of the Greek alphabet.
Sigma may also refer to:
Aviation
- Advance Sigma, a Swiss paraglider design
Companies
- SIGMA (verification service), Nielsen Media Research's tracking system for videos
- Sigma AB, a Swedish IT consultancy company
- Sigma Corporation, a Japanese camera and lens manufacturer
- Sigma Designs, Inc., a US semiconductor manufacturer
- Sigma Motor Corporation, a defunct South African motor vehicle assembler and manufacturer
- Sigma Motors, a Pakistani assembler of Land Rovers
- Sigma (operations research)
- Sigma Healthcare, an Australian pharmaceutical company
- Sigma Sport, a German manufacturer of electronic sports equipment
- Sigma TV, a television channel in Cyprus
- 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
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
- or , sets in the analytical hierarchy
- , a set in the polynomial hierarchy
- Harish-Chandra's σ function
- Weierstrass sigma function
- Sigma additivity
Places
- Sigma, Capiz, a municipality in the Philippines
- Sigma, Lee County, Virginia, United States
- The Sigma Plan, to raise the dikes of the Scheldt River in Belgium
Products
- Sigma (sailplane)
- Mitsubishi Sigma
- GM Sigma platform, an automobile platform
- Smith & Wesson Sigma, a firearm
- Sigma Guitars
- The SDS Sigma series of computers from Scientific Data Systems
Science
- Stefan–Boltzmann constant of radiation in physics σ
- Sigma factor of RNA polymerase in biology σ
- In the Hammett equation, the electronic substituent constant σ for activation of substituted arenes
- Sigma baryon, in particle physics
- Pauli matrices in quantum physics
- Cross section σ in physics
- Sigma bond in chemistry σ
- Sigma receptor, a neural receptor
- Electrical conductivity, a measure of a material's ability to conduct electricity σ
- Surface charge density in classical electromagnetism
- Stress (mechanics), the force per unit area applied by internal forces of a material σ
Video games
- Sigma (Mega Man X), the villain of the Mega Man X series
- Sigma (Overwatch), a hero from 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
- Sigma (couch), used in ancient Roman banquets
- Sigma (DJs), a British drum and bass duo
- Sigma AZ (band), punk rock band from Phoenix, Arizona
- Sigma class corvette, a naval ship
- The Six Sigma quality management program
- SK Sigma Olomouc, a Czech association football team
- Histor–Sigma, a Belgian professional cycling team known as Sigma in 1986
- Sigma (album)
- Lone wolf (trait), referred to in humans as the Sigma personality trait
- Sigma FC, a Canadian soccer team
- Sigma Sigma Sigma (Tri-Sigma), an American women sorority centered on education & scholarship
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