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An exclamation mark stands for factorial.

For instance, if the number is 7!, then that would be 7x6x5x4x3x2x1.

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Factorial means you multiply the integer written by every integer below it until you reach 1. Oddly enough, 0! = 1.

There is also a 'factorial' function for non-integral values, called the Gamma function.

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Q: What does an exclamation point mean as a math symbol?
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