# Beta (disambiguation)

Beta (B, β) is the second letter of the Greek alphabet.
Beta or BETA may also refer to:

## Arts, entertainment, and media
### Films

* Beta (film), a 1992 Bollywood film directed by Indra Kumar
* Beta Test (film), a 2016 American science fiction film directed by Nicholas Gyeney
* The Beta Test, a 2021 American dark comedy film directed by Jim Cummings

### Fictional entities

* BETA (Muv-Luv) (Beings of the Extra Terrestrial origin which is Adversary of human race), an alien race from the video game series Muv-Luv
* β, a classification of strength in the Earthbound, or Mother, series of Nintendo role-playing games
* Beta, a wolf character in the animated film Storks
* BETA, an organization in the 1986 TV series The Adventures of the Galaxy Rangers
* Beta (The Walking Dead), an antagonist in the Walking Dead comic series
* Beta Hirogen, the second in command of a Hirogen hunting party, as seen in Star Trek: Voyager
* Beta Quadrant, one of four quadrants in the galaxy in Star Trek

### Other uses in arts, entertainment, and media

* Beta (Magic: The Gathering), the second (revised) part of the first set of the card game Magic: The Gathering
* Beta chord
* Beta News Agency, Serbian independent news agency
* Beta Recordings, a record label headed by John B
* Lifetime (TV network), pre-launch branded as BETA
* beta, a combat robot competing in BattleBots
* Beta, a mountain biking magazine and website launched by Outside (company) in 2021

## Mathematics, finance, and statistics

* Beta (finance), the β coefficient in the capital asset pricing model
* β, the probability of a Type II error in statistics; See Type I and type II errors
* β-reduction, a reduction rule for lambda calculus
* Beta distribution, in statistics, a family of continuous probability distributions
* Beta function, a special function also known as the Euler integral of the first kind
* Beta invariant, of a matroid
* Dirichlet beta function
* Eratosthenes, Greek mathematician nicknamed Beta (Βῆτα)
* Standardized coefficient or beta coefficient, in statistics, the estimate of an analysis performed on variables that have been standardized so that they have variances of 1

## Organisations

* Beta (motorcycle manufacturer), an Italian off-road motorcycles manufacturer
* BETA Cargo, a defunct Brazilian airline
* Beta Technologies, a US electric aircraft manufacturer
* British Equestrian Trade Association, a membership organisation in the United Kingdom
* Broadcasting and Entertainment Trades Alliance, sometimes known by the acronym "BETA"
* National Beta Club, a high school honor society
* South Texas Business Education & Technology Academy (BETA)

## Places

* Beta, Ohio, a ghost town in the United States
* Beța, a village in Lopadea Nouă Commune, Alba County, Romania
* Beta, a village in Mugeni Commune, Harghita County, Romania
* Beta Israel, a name given to Jewish communities that occupied territories of the Aksumite and Ethiopian (Habesh or Abyssinia) empires
* Beta (Olt), a tributary of the Olt in Harghita County, Romania
* Beta, a tributary of the Târnava Mare in Harghita County, Romania

## Psychology

* Beta movement, a perceptual illusion whereby two or more still images are combined by the brain into surmised motion
* Beta quadra, one of the four quadras in socionics
* Type-beta, a personality type now commonly referred to as type-B; See Type A and Type B personality theory

## Science
### Biology and medicine

* Beta (plant), a genus of flowering plants, mostly referred to as beets
* Beta (grape), a variety of North American grape
* β$_1$ and β$_2$, or beta-1 and beta-2, adrenergic receptors
* Beta, a rank in a community of social animals; See Alpha
* Beta carbon, in organic chemistry—the second carbon atom in a chain when counting from a functional group; See Alpha and beta carbon
* Beta cell, a type of cell in the pancreas, which produces insulin
* Beta sheet, a secondary protein structure
* Beta-endorphin, a kind of neurotransmitter
* SARS-CoV-2 Beta variant, one of the variants of SARS-CoV-2, the virus that causes COVID-19

### Physics

* Beta (plasma physics), the ratio of thermal to magnetic pressure in plasma
* Beta (velocity), the speed of an object relative to the speed of light in special relativity.
* β, a symbol for compressibility, a measure of the relative volume change of a fluid or solid as a response to a pressure change
* Beta function (physics), also β(g)—a function in quantum field theory
* Beta particle, a name used to refer to high-energy electrons (β$^−$) or positrons (β$^+$) emitted by certain types of radioactive nuclei
* Phase Constant (β), in electromagnetics and electrical engineering, used in the theory of plane waves; See Propagation constant
* Precursor yield fraction, leading to delayed neutrons in nuclear reactors
* Thermodynamic beta, in thermodynamics and statistical mechanics—a numerical quantity related to the thermodynamic temperature of a system

### Other uses in science

* Hurricane Beta, a 2005 hurricane
* Tropical Storm Beta (2020), a 2020 tropical storm

## Sports

* Beta (climbing), climbing jargon that designates information about a climb
* Beta Ethniki, the second tier division of the Greek football (soccer) league

## Technology

* Beta (time signal), a time signal service broadcast in the very low frequency range in Russia
* Beta, the common-emitter current gain of a bipolar junction transistor
* Betacam, a family of half-inch professional videotape products developed by Sony
* Betamax, home videocassette tape recording format developed by Sony
* BETA (programming language), a programming language
* Beta release, or betaware, a phase in software development before an official release
* Flat or reverse-pitch propeller settings used for ground operations in airplanes with turboprop engines
* Perpetual beta, software or a system that never leaves the beta development stage

## Other uses

* Advance Bi Beta, a Swiss paraglider design
* Beta male (slang), a pejorative term for a man considered as weak and emasculated
* Lancia Beta, a car produced by Lancia
* Beta reader, a person who critiques a written work prior to public release
* Voiced bilabial fricative (β), the voiced bilabial fricative symbol of the International Phonetic Alphabet