Describe symbolism in Postmodernism by

Postmodernism is the name given to the period of literary criticism that is now in full bloom. Just as the name implies, it is the period that comes after the modern period. But these are not easily separated into discrete units limited by dates as centuries or presidential terms are limited. Postmodernism came about as a reaction to the established modernist era, which itself was a reaction to the established tenets of the nineteenth century and before. I'm not sure if there are specific symbols that indicate the genre.