What does this terminology mean?

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The discussion clarifies the notation used in the formula for the nth derivative of the function y = x-1, specifically the exclamation mark (!), which denotes the factorial operation. The formula presented is y(n)(x) = (-1)nn!x-n-1, where n! represents the product of all positive integers up to n. This notation is essential for understanding the behavior of derivatives in calculus, particularly in relation to polynomial functions.

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Dustobusto
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So in finding a pattern for the nth derivative for y = x-1 the book wrote

y(n)(x) = (-1)nn!x-n-1

What does the exclamation mark mean? I know != means not equal to.
 
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