自乘

zìchéng
(math.) to multiply (a number) by itself; to raise (a number) to a power; (esp.) to square (a number)

CEDICT

math

Entry Composition

1 自 zì
  1. (bound form) self; oneself
  2. from; since
  3. naturally; as a matter of course
=2 乘 chéng
  1. to ride
  2. to mount
  3. to make use of
  4. to avail oneself of
  5. to take advantage of
  6. to multiply (math.)
  7. Buddhist sect or creed
=2 乘 chéng old variant of 乘 chéng