Gamma
| Greek letters | |
| Α α Alpha | Β β Beta |
| Γ γ Gamma | Δ δ Delta |
| Ε ε Epsilon | Ϝ ϝ Digamma |
| Ζ ζ Zeta | Η η Eta |
| Θ θ Theta | Ι ι Iota |
| Κ κ Kappa | Λ λ Lambda |
| Μ μ Mu | Ν ν Nu |
| Ξ ξ Xi | Ο ο Omicron |
| Π π Pi | Ϻ ϻ San |
| Ϙ ϙ Qoppa | Ρ ρ Rho |
| Σ σ Sigma | Τ τ Tau |
| Υ υ Upsilon | Φ φ Phi |
| Χ χ Chi | Ψ ψ Psi |
| Ω ω Omega | Ϡ ϡ Sampi |
| Greek alphabet | |
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 gamma function (related to factorials) in mathematics.
- The reflection coefficient in electrical engineering.
- The Euler-Mascheroni constant in mathematics.
- The photon, seen 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. Often the letter kappa κ is used.