Gamma

It gives its name to several things:

• Gamma characteristic power law, and gamma correction in television and computer display systems. gamma refers to 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 lower-case letter γ is used as the symbol for:

• The Euler-Mascheroni constant in mathematics.
• The photon, seen (pun intended) 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.

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