Factorial moment

Factorial moment is a way to measure the complexity of a system. It's a number that can tell us how many different pieces of information or "patterns" are present in the system. To calculate a factorial moment, you look at each piece of information in the system and then you multiply them all together. For example, if a system has 3 pieces of information, then you would multiply them like this: 3 x 2 x 1 = 6. The result, 6, is the factorial moment.