What does an exclamation mark mean in Math?

Mathematicians use a variety of symbols, including the exclamation mark, to indicate factorials. When an exclamation point is used in front of a positive integer, it means that one should find the integers that follow the positive integer up to the number 1. For example, 2! Equals 2 multiplied by 1. Exclamation mark (!) indicates a factorial calculation. Factoring is the process of multiplying by negative positive integers. For example, 5! = 5 ∗ 4 ∗ 3 ∗ 2 ∗ 1 = 120.

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