What is a Symbol?
A symbol is anything, really, that can stand in for something else.
pi is the symbol for the ratio of a circle’s circumference to its diameter, an irrational.Archimedes
phi is the symbol for the golden ratio, a + b / a = a / b, also an irrational. Michael Maestlin
In programming we use symbols to represent whatever we want them to represent, they’re called variables.
MY_SYMBOL = "Whatever I want it to represent".