Exclamation Mark Symbol
The exclamation mark is used to represent the unary factorial operator. The factorial operator is used in calculating the number of combinations and permutations of a set or number of items.
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The combination formula describes the possible combinations of r elements out of a group of n elements where order does not matter.
The permutation formula describes the possible permutations of r elements out of a group of n elements where order does matter.
The number of permutations of n distinct items is given by n factorial. A permutation is a unique ordering or arangment of the set of items.
The exclamation mark is used to represent the factorial of a number in mathematics. A factorial is a unary operator.