Alpha

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Alpha may refer to:

The Greek letter alpha

Alpha (letter), a letter in the Greek alphabet. α may be used as the symbol for:
* Angle of attack in aerodynamics
* Common-base current gain of a transistor in electronics
* In physics
** Fine-structure constant, a fundamental physical constant
** Alpha particle, form of particle radiation
** H-alpha, or H-α, an emission line created by hydrogen atoms
* Alpha carbon organic chemistry to indicate the position of a group in a molecule
* In Bayer designation, the typically brightest star in a constellation
* The significance level in statistical hypothesis testing
* Opacity in computer graphics
* The alpha coefficient in Evaluating Financial Returns

Place names

Media and literature

Alpha (band), a British electronic music group.
Alpha (computer), a fictional computer in Mike Walker's radio play Alpha
, the first Magic: The Gathering cards set
Alpha 5/Alpha 6/Alpha 7, nicknames of the characters in the Power Rangers television programs
Alpha TV, a Greek terrestrial channel
ARC Trooper A-17, nicknamed "Alpha", a character from various Star Wars comics
The highest social class in Aldous Huxley's novel Brave New World.
The primary setting for the fictional television series
The Robot on the Original Mighty Morphin Power Rangers
Alpha the Ultimate Mutant, a character featured in Marvel Comics.

Science and mathematics

Alpha (biology), "alpha male" and "alpha female", the highest ranking individuals in a community of social animals
Alpha (Investment), a measuring of risk-adjusted performance
Alpha (Machine learning), the degree to which a learning agent takes into account new information
Alpha (Radio navigation), a Russian radio navigation system, similar to the former Omega Navigation System
Alpha channel, a transparency information layer to supplement the three RGB color layers to make the RGBA color space.
Alpha waves, recorded by electroencephalography
Cronbach's alpha, a statistical measure of reliability.
DEC Alpha, a microprocessor from Digital Equipment Corporation.
Space Station Alpha, an alernative name for the Space Station Freedom
A unofficial call sign for the International Space Station
An early development stage in software engineering (e.g. an Alpha version)

Other

Alpha 2000, a light aircraft built in New Zealand
Alpha Group, a dedicated counter-terrorism unit that belongs to OSNAZ
Alpha class submarine, a Russian fast attack nuclear submarine
Alpha course, an introductory course in Christianity
Tropical Storm Alpha (2005)
Alpha 5, from the Mighty Morphin Power Rangers series and movie.
Alpha was the last boss in the video game: Megaman Battle Network 3

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