阶乘

阶乘	jiē chéng	the factorial of a number, e.g. 5! = 5.4.3.2.1 = 120
阶	jiē	variant of 阶
阶	jiē	rank or step / stairs
乘	Chéng	surname Cheng
乘	chéng	to ride / to mount / to make use of / to avail oneself of / to take advantage of / to multiply (math.) / Buddhist sect or creed
乘	shèng	(archaic) four horse military chariot / (archaic) four / generic term for history books
乘	chéng	old variant of 乘