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Gamma (upper case Γ, lower case γ) is the 3rd 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.

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 reflection coefficient in electrical engineering.

The lower-case letter γ is used as the symbol for:

• The Euler-Mascheroni constantThe Euler-Mascheroni constant is a mathematical constant, used mainly in number theory, and is defined as the limiting difference between the harmonic series and the natural logarithm: : Intriguingly, the constant is also given by the integral: : Its valu in mathematics.
• The photonFor the Japanese anime video, see Photon (anime). In physics, the photon (from Greek φοτος, meaning light is a quantum of excitation of the quantised electromagnetic field and is one of the elementary particles studied by qu, seen as an elementary particle in physics.
• Gamma rayThis article is about electromagnatic radiation. For the power metal band, see Gamma Ray (band Gamma rays (often denoted by the Greek letter gamma, γ) are an energetic form of electromagnetic radiation (see Electromagnetic spectrum) produced by radis in physics and astronomy.
• The gamma factorThe Lorentz factor is a convenient term to define in special relativity. It is usually defined : where : is the velocity u in units of c the speed of light. Note that if tanh r beta , then gamma cosh r''. Here r is known as the rapidity . Rapidity has the in relativity theory and astronomy.
• The adiabatic indexThe adiabatic index of a gas, usually denoted by the symbol κ ( kappa) (also called γ), is the ratio of its specific heat at constant pressure (c) to its specific heat at constant volume (c). kappa; c/c One can easily understand the relation i of a gas in physics. Often the letter kappa κ is used.

Letters that arose from Gamma are the Roman CIf you were looking for the C, C++, or C# programming languages then see C programming language, C plus plus, or C Sharp programming language C is the third letter of the Roman alphabet. In the Etruscan language, plosive consonants had no distinctive voic and GG is the seventh letter in the Roman alphabet. History The letter G was created by the Romans because they felt that C was not an adequate letter to represent both /k/ and /g/. Fascinatingly, the alleged inventor is a known historical figure, Spurius Carv and the Cyrillic letter GheGhe (, , also called "ge with upturn") is a letter of the Cyrillic alphabet pronounced like the G in "go". Originally part of the Ukrainian and Belarusian alphabets, its function was replaced by the letter Ge in the Soviet Union. In Ukrainian, it continue.