An illustration of an eye.
A picture of an eye meaning the word "eye" in a message is an example of a pictogram.
Origin of pictogramLatin pictus, past participle of pingere, to paint; see pictograph + –gram.
Strictly speaking, a pictogram represents by illustration, an ideogram represents an idea, and a logogram represents a word: Chinese characters are all logograms, but few are pictograms or ideograms. Casually, pictogram is used to represent all of these: it is a picture representing some concept.