# Gamma (disambiguation)

Gamma (Γ or γ) is the third letter of the Greek alphabet.
Gamma may also refer to:

## Science and technology

* Tropical Storm Gamma (2005), that made landfall in Honduras
* Hurricane Gamma, that made landfall on the Yucatán Peninsula in 2020
* Gamma correction, a property of images and video displays
* Γ, the representation of molecular symmetry in inorganic chemistry

### Computing

* Gamma software, a stage in the software release life cycle
* Elias gamma coding, in computer science, encoding, compression

### Mathematics

* Euler's constant (γ), a mathematical constant
* Gamma test (statistics) (γ) or Goodman and Kruskal's gamma, a statistical test
* Gamma distribution (Γ), a probability distribution function
* Gamma function (Γ), a mathematical function
* P-adic gamma function (Γ), a mathematical function
* Feferman–Schütte ordinal Γ$_0$
* Typing environment (Γ), within a type system

### Physics

* Gamma ray or gamma radiation (γ or $\gamma$), an electromagnetic ray
* Photon (γ), an elementary particle, the quantum of the electromagnetic field
* Propagation constant (γ), of an electromagnetic wave
* Heat capacity ratio or adiabatic index (γ), the ratio of the heat capacity at constant pressure to that at constant volume
* Lorentz factor (γ), in relativity and astronomy
* Gamma (eclipse) (γ), how central (how close to the middle of the body) an eclipse is
* Shear strain (γ)
* Surface tension (γ)
* Body effect (γ), on threshold voltage in field-effect transistor technology
* Christoffel symbols (Γ), in general relativity
* Circulation (physics) (Γ)
* Reflection coefficient (Γ), of a wave reflected by an impedance discontinuity
* Decay width (Γ), of a particle in high-energy physics
* GAMMA, an extensive air shower array in Armenia
* γ, a non-SI unit of magnetic flux density, 1nT
* γ, the third-brightest star of a constellation, in Bayer designation
* Γ, center of the Brillouin zone

### Biology and medicine

* Gamma wave, a type of brain wave
* Gamma-glutamyltransferase, a transferase present in the cell membranes of many tissues
* SARS-CoV-2 Gamma variant, one of the variants of SARS-CoV-2, the virus that causes COVID-19
* gamma-Hydroxybutyric acid, a neurotransmitter and a depressant drug
* gamma-hexachlorocyclohexane or Lindane, an organochlorine chemical and neurotoxin

## Places

* Gamma, Missouri, a community in the US
* Gamma Island (Greenland)
* Gamma Peak, a mountain in the US

## Transportation

* General Motors Gamma platform, a subcompact automobile platform by General Motors
* Bristol Siddeley Gamma, a family of British rocket engines
* Hyundai Gamma engine, a family of 1.6 L gasoline inline-4 engines
* Suzuki RG250 Gamma, a two-stroke motorcycle
* Lancia Gamma, an executive coupe by Fiat subsidiary Lancia

## Companies and organizations

* Gamma (store), a Dutch hardware-store chain
* Gamma Group, developers of FinFisher and associated suites of malware
* Gamma (agency), a French photo agency
* Groupe des Architectes Modernes Marocains, an architecture collective in Morocco
* Gamma (media company), founded in 2023

## Arts and entertainment

* Gamma (band), American rock band
* Gamma (miniseries), a 1975 Italian television miniseries
* Gamma (wrestler), a Japanese professional wrestler working for the Dragon Gate promotion
* Gamma chord, a type of musical chord
* Gamma (album), a 2024 album by Gesaffelstein

### Fictional entities

* E-102 Gamma, one of the E-Series robots in the Sonic the Hedgehog franchise
* Gamma Akutabi, a fictional character from the manga Zombiepowder.
* Γ, the emblem of the character Waluigi in the Mario franchise
* Gamma Metroids, an evolution of the Metroid species from the game Metroid II: Return of Samus
* Gamma radiation, responsible for creation of, and the power source to, The Incredible Hulk and derivative characters

## Linguistics

* Latin gamma (ɣ), an IPA symbol for voiced velar fricative and in the alphabets of African languages
* Voiced velar fricative (γ), in phonetics

## Other uses

* Gamma (finance) (Γ), a second order derivative of an option pricing formula
* Gamma, a classification of sensitive compartmented information