The Greek letter (beta) is used in math as a variable.
Symbol  Format  Data 

β  Unicode 

TeX 


SVG 
A variable is a core concept in algebra where a symbol, usualy a lower case latin letter, is used as a placeholder in a math expression.
The Greek Alphabet is used throughout math to represent variables, constants, and coeffecients within math expressions, formulas, and equations.
The capital Greek letter (Β).