The latin letter g is often used in mathematics to represent a function. Typically, the symbol is used in a expression like this: . In plain language, this represents the function which takes in a number as input.
A function takes input and produces output. The idea is a useful way to abstract away complexity and, especially in the age of computers, is a practical tool to solve problems.
The Latin Alphabet is a collection of 26 symbols that form the basis of the English language. The alphabet's symbols are used throughout mathematics to represent variables, constants, and coeffecients.
The capital Latin letter G.