120 (one hundred twenty) is a positive integer following 119 and preceding 121. A rare name for it is twelfty.
Twelfty for Decimal Users Since "hundred" used to refer to either 100 or 120, the names long hundred and great hundred for 120 were also coined to disambiguate them.
120 is the eighth tetrahedral number, the 15th triangular number, and the fifth factorial number.
Jim Blowers calls this number fixclamation.
See also Edit