Sigma (disambiguation)

Look up sigma, Sigma, Σ, σ, or ς in Wiktionary, the free dictionary.

Sigma (Σ or σ, word-final lowercase ς) is the 18th letter of the Greek alphabet.

Sigma may also refer to:

• 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

• 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

• 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
• ${\displaystyle \Sigma _{n}^{0}}$ or ${\displaystyle \Sigma _{n}^{1}}$, sets in the analytical hierarchy
• ${\displaystyle \Sigma _{i}^{P}}$, a set in the polynomial hierarchy
• Harish-Chandra's σ function
• Weierstrass sigma function
• Sigma additivity

• Sigma (album)
• Sigma (DJs), a British drum and bass duo
• Sigma AZ (band), punk rock band from Phoenix, Arizona

• 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

• 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

• 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:
  • Sigma Canis Majoris
  • Sigma Draconis
  • Sigma Octantis
  • Sigma Orionis

• 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

• 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

• Advance Sigma, a Swiss paraglider design
• Sigma (couch), used in ancient Roman banquets
• Sigma class corvette, a naval ship
• Sigma male, a slang term for masculine men

• Sygma (disambiguation)
• M–sigma relation

This disambiguation page lists articles associated with the title Sigma.
If an internal link led you here, you may wish to change the link to point directly to the intended article.