The currency abbreviation or the currency symbol for the Indonesian Rupiah (IDR). The Rupiah is made up of 100 sen, and is often presented with the symbol (Rp). The Rupiah derives its name from its sister currency the Indian Rupee. The Riau Islands and the Indonesian half of New Guinea both had their own versions of the Rupiah at one time, but both have been absorbed by the Indonesian currency. 

|||The Indonesian Rupiah was first seen in October of 1946 and substantially revised in 1950, when it received international recognition and replaced all former Dutch, Javanese and Japanese currencies being used. It underwent a 1000 to 1 reversion in 1965, but continued to lose value over the years. Its devaluation played a substantial role in the overthrow of the Suharto regime in 1998.