Gamma

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This article is about the letter. For the electromagnetic ray, see Gamma ray

Greek alphabet
[[Image:Greek alphabet {{{letter\|alpha-omega}}}.png\| 200px\|center]]
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 ς Sigma
Τ τ Tau	Υ υ Upsilon
Φ φ Phi	Χ χ Chi
Ψ ψ Psi	Ω ω Omega
obsolete letters
Image:Greek alphabet digamma2.png Digamma	Image:Greek alphabet san.png San
Image:Greek alphabet qoppa.png Qoppa	Image:Greek alphabet sampi.png Sampi
Image:Greek alphabet stigma.png Stigma	Image:Greek alphabet sho.png Sho

In Modern Greek, it is pronounced [[voiced velar fricative|Template:IPA]] or [[Voiced palatal fricative|Template:IPA]], and in Ancient Greek, it was pronounced [[voiced velar plosive|Template:IPA]] or [[velar nasal|Template:IPA]] before plosives.

Gamma is often used to denote a variable in mathematics and physics. In certain areas it has specific meaning.

Gamma correction in photography, television and computer display systems. Gamma is the exponent in a power-law relationship between video or pixel values and the displayed brightness. In photography it is the slope of the curve of (density or log(opacity)) of the film image versus log(exposure) (the Hurter-Driffield curve), in the straight line region.
1 gamma is a unit of magnetic flux density, 1 gamma = 10⁻⁹ tesla or 1 nanotesla.
Gamma waves are a type of brain waves around 40 hertz.
Gamma rays are the highest point on the electromagnetic spectrum.

The upper-case letter Γ is used as the symbol for:

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 Lorentz 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.
A micro gram. This use is deprecated by the SI.

In the game of Tetris, gamma is another name for the J tetromino.
E-102 Gamma is a fictional robotic character in the Sonic the Hedgehog universe.
Gamma is a giant peace-keeping robot stolen by Dr. Wily which is the final boss of Capcom's Nintendo game Megaman 3.
Gamma is the third caste in Aldous Huxley's dystopic satire Brave New World.
The Nintendo character Waluigi has an upside-down "L" on his hat the looks like "Γ" to some people, keeping in theme with Wario's upside-down "M".