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Gamma

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

Letters that arose from Gamma are the Roman C and G and the Cyrillic letter Ghe.
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