Α
Symbol  Format  Data 

Α  Code Point 
U+0391 
TeX 
\Alpha 

SVG 
The capital Greek letter (capital alpha) is visually very similar to the uppercase Latin letter A. For that reason, refer to the usage of Capital A for how the symbol appears in math.
The 'α' is a letter of the Greek alphabet. In mathematics, physics, and engineering, it is often used to denote an angle, a coefficient of thermal expansion, an alpha particle, among other uses.
The capital Latin letter A is used in mathematics as a variable to represent a set, a vector, or a matrix.