Sigma (disambiguation)

From Wikipedia, the free encyclopedia

Sigma may refer to:

• Sigma (Σ, σ, or ς), of the Greek alphabet

Companies:

• Sigma TV a television channel in Cyprus
• Sigma Company, an Australian company. Its main operations include Pharmaceuticals and Pharmacies
• Sigma Corporation, a Japanese camera and lens manufacturer
• Sigma Company Limited, a Hungarian debt management company
• Sigma Designs, Inc., a US semiconductor manufacturer
• SIGMA (verification service), Nielsen Media Research's tracking system for videos
• SIGMA (insurance), an Albanian insurance company
• Sigma-Aldrich Corporation
• Sigma Sport, a German manufacturer of electronic sports equipment

In science:

• 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
• Stefan-Boltzmann constant of radiation in physics σ
• Sigma factor of RNA polymerase in biology σ
• Sigma (chemistry), the electronic substituent constant of molecules in physical chemistry σ
• Sigma baryon, a class of baryons in particle physics
• Pauli matrices in quantum physics
• Cross section
• Sigma bond in chemistry σ
• Sigma receptor, a subtype of opioid receptor
• Sigma (meteorology), a ratio of pressure in the atmosphere.

In geography:

• Sigma, Capiz, a municipality in the Philippines

In economics:

• SIGMA (Economic Model), a practical macroeconomic model developed by the Federal Reserve's International Finance Department

In popular culture:

• Mitsubishi Sigma, motor car, a variant of the Galant
• GM Sigma platform, a mid-size car automobile platform from General Motors Corporation
• Six Sigma, a quality management program
• Smith & Wesson Sigma, a Smith & Wesson firearm
• Sigma (Mega Man X), villain in the Mega Man X video game series
• Ninja Gaiden Sigma, a PlayStation 3 title in the Ninja Gaiden video game series