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.
Symbol  Format  Data 

Α  Unicode 

TeX 


SVG 
The capital Latin letter A is used in mathematics as a variable. In linear algebra the symbol is used to represent a matrix. In probability the symbol is used to represent a random variable. The symbol also appears in various formulas.
The Greek letter alpha (α) is used in math as a variable.