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The duodecimal system (also known as base 12, dozenal, or rarely uncial) is the number system with a base of twelve. In the dozenal system, large numbers are expressed by groups of 12. For example, the number fifty (which we usually write as 50) would be written as 42 in the dozenal system, since it is equal to 4×12+2.

The number 12 is the smallest number that has four factors (2, 3, 4, 6).