Gamma n. : The third letter (/, / = Eng. G) of the Greek alphabet.

Example:
What particles are emitted when Gamma rays strike a metal plate? What is the phenomenon called?

Taxonomy
gamma, symbol, free encyclopedia, Latin gamma, lowercase, Ancient Greek, gamma radiation, gamma correction, gamma function, the Greek alphabet, Cyrillic letters, search, free dictionary, kappa, characters, uppercase, third letter, the Roman.

Defination from the web:
Gamma (uppercase Γ, lowercase γ; Greek: Γάμμα) is the third letter of the Greek alphabet. ... Letters that arose from Gamma include the Roman C and G and the Cyrillic letters Ge Г and Ghe Ґ. ... In mathematics, the gamma function (usually written as Γ-function) is an extension of the ...