a kind of puzzle in which pictures stand for words
In a rebus, a picture of a bat indicates that the answer-word will contain the syllable bat.
Re (read)+bus imagine u r in bus. so for tp u start reading book but reading is difficult in bus. so you buy the book which has pictures in place of words now its really easy to read it. so here picture represents words. Reading+At+BUS Bus routes in the cities are denoted with symbols (25B, 108D) and pictures (eg. airport) rather than names of palces.