It is first alphabet
Alpha is the first letter of the greek alphabet (like the letter "a") Here are some meanings for alpha beyond being the first letter of the Greek "alpha"bet. :)
Alpha (letter), a letter in the Greek alphabet. According to Wikipedia, 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
The alpha carbon in organic chemistry
In Bayer designation, the typically brightest star in a constellation
The significance level in statistical hypothesis testing
Alpha channel, describing transparency and opacity in computer graphics
The alpha coefficient in evaluating financial returns
Thermal diffusivity
Alpha (letter), a letter in the Greek alphabet. According to Wikipedia, 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
The alpha carbon in organic chemistry
In Bayer designation, the typically brightest star in a constellation
The significance level in statistical hypothesis testing
Alpha channel, describing transparency and opacity in computer graphics
The alpha coefficient in evaluating financial returns
Thermal diffusivity