symbolism
sym.bol.ism \'sim-b*-.liz-*m\ n 1: the art or practice of using symbols esp. by investing things with a sym bolic meaning or by expressing the invisible or intangible by means of visible or sensuous representations : as 1a: the use of conventional or traditional signs in the representation of d ivine beings and spirits 1b: artistic imitation or invention that is a method of revealing or sugges ting immaterial, ideal, or otherwise intangible truth or states 2: a system of symbols or representations
Webster's English Dictionary