Alpha may refer to: Greek letter Alpha is the name given to the first letter of the greek alphabet.Alpha , a letter in the Greek alphabet. α may be used as the symbol for: · Alpha channel, describing transparency and opacity in computer graphics · Angle of attack in aerodynamics · Common-base current gain of a transistor in electronics · The alpha carbon in organic chemistry · The significance level in statistical hypothesis testing · Thermal diffusivity · Coefficient of thermal expansion in thermodynamics · A symbol to denote Direct proportion, in mathematics · In Astronomy (Bayer designation): · The brightest star in a constellation. · The first unit in a sequence. Physics · Alpha particle, form of particle radiation · Angular acceleration · Fine-structure constant, a fundamental physical cons

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