(1):

(v. t.) To mark or indicate by a rebus.

(2):

(n.) A pictorial suggestion on a coat of arms of the name of the person to whom it belongs. See Canting arms, under Canting.

(3):

(n.) A mode of expressing words and phrases by pictures of objects whose names resemble those words, or the syllables of which they are composed; enigmatical representation of words by figures; hence, a peculiar form of riddle made up of such representations.