Idiyappam, also known as string hopper, indiappa, noolputtu, noolappam, or ottu shavige, is a string hopper dish originating from southern India. It consists of rice flour pressed into noodles, laid into a flat disc-like shape and steamed. The dish also spread to Southeast Asia, where it is called putu mayam in Malaysia and Singapore, and putu mayang in Indonesia.

Rice flour is a form of flour made from finely milled rice. It is distinct from rice starch, which is usually produced by steeping rice in lye. Rice flour is a common substitute for wheat flour. It is also used as a thickening agent in recipes that are refrigerated or frozen since it inhibits liquid separation.