g
Symbol  Format  Data 

g  Code Point 

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SVG 
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.
The capital Latin letter G.
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.