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:
The upper-case letter Γ is used as the symbol for:\n* The
gamma function (related to factorials) in mathematics.\n* The
reflection coefficient in
electrical engineering.
The lower-case letter γ is used as the symbol for:\n* The
Euler-Mascheroni constant in mathematics.\n* The
photon, seen as an elementary particle in physics.\n*
Gamma rays in physics and astronomy.\n* The
gamma factor in relativity theory and astronomy.\n* The
adiabatic index of a gas in physics. Often the letter kappa κ is used.
Letters that arose from Gamma are the Roman
C and
G and the Cyrillic letter
Ghe.
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