Capital Alpha Symbol
The capital Greek letter (alpha) is visually very similar to the upper-case Latin letter A. For that reason, refer to the usage of Capital A for how the symbol appears in math.
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.