Γγ

GAMMA

γάμμα · [g]

The 3rd letter of the Greek alphabet.

MATHEMATICS

  • Gamma function Γ(·).
  • Euler–Mascheroni constant (γ) in analysis.

PROBABILITY

  • Gamma distribution (shape/scale conventions).
  • Appears in Poisson–Gamma conjugacy.

STATISTICS

  • Used in models/estimation with Gamma/Exponential families.
  • Shows up in likelihoods and special functions.

PRONUNCIATION

Ancient Greek
sound [g]
Modern Greek
γάμμα [ˈɣama] · sound [ɣ] (before e/i: [ʝ])

IN FORMULAS

  • Γ(n) = (n − 1)!The Gamma function extends the factorial (here, for whole n ≥ 1).

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lowercase
uppercase

Note: notations vary between books/fields; these are the most common usages.