What does (n!) indicate in mathematics?

Expect we have 4 digits 1,2,3,4. Now we would like to know the number of numbers can be made from these 4 digits 1,2,3,4, for this we will need to note all the sexual acts of the digits however it will bore and tedious since the variety of possible series can be more. Has actually developed a method to streamline this essential computation which is called
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