Gamma
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| Greek alphabet | |
|---|---|
| Α α Alpha | Β β Beta |
| Γ γ Gamma | Δ δ Delta |
| Ε ε Epsilon | Ζ ζ Zeta |
| Η η Eta | Θ θ Theta |
| Ι ι Iota | Κ κ Kappa |
| Λ λ Lambda | Μ μ Mu |
| Ν ν Nu | Ξ ξ Xi |
| Ο ο Omicron | Π π Pi |
| Ρ ρ Rho | Σ σ Sigma |
| Τ τ Tau | Υ υ Upsilon |
| Φ φ Phi | Χ χ Chi |
| Ψ ψ Psi | Ω ω Omega |
| obsolete letters | |
| [[Digamma|Template:Polytonic Digamma]] | [[San (letter)|Template:Polytonic San]] |
| [[Qoppa|Template:Polytonic Qoppa]] | [[Sampi|Template:Polytonic Sampi]] |
Gamma (upper case Γ, lower case γ) is the third letter of the Greek alphabet. In the system of Greek numerals it has a value of 3.
It gives its name to several things:
- Gamma characteristic power law, and gamma correction in television and computer display systems. Gamma is the exponent in a power-law relationship between video or pixel values and the displayed brightness.
- In the game of Tetris, gamma is another name for the J tetromino.
- 1 gamma is a unit of magnetic flux density, 1 gamma = 10−9 tesla or 1 nanotesla.
The upper-case letter Γ is used as the symbol for:
- The gamma function (related to factorials) in mathematics.
- The Gamma distribution in probability theory and statistics.
- The symbol for Γ is used on the hat of the videogame character Waluigi
- The reflection coefficient in electrical engineering.
Gamma is the third caste in Aldous Huxley's dystopic satire Brave New World.
The lower-case letter γ is used as the symbol for:
- The Euler-Mascheroni constant in mathematics.
- A risk management measure in mathematical finance.
- The photon, seen as an elementary particle in physics.
- Gamma rays in physics and astronomy.
- The gamma factor in relativity theory and astronomy.
- The adiabatic index of a gas in physics. Often the letter kappa κ is used.
- The propagation constant of an electromagnetic wave (in electrical engineering and electromagnetic theory).
- The third brightest (usually) star in a constellation. See Bayer designation.
Letters that arose from Gamma are the Roman C and G and the Cyrillic letter Ghe.
da:Gamma (bogstav) de:Gamma el:Γ es:Gamma fr:Γ la:Gamma ja:Γ nl:Gamma (letter) pl:Gamma pt:γ fi:Gamma sv:Gamma