The rupiah (Rp) is the official currency of Indonesia. Issued and controlled by Bank Indonesia, its ISO 4217 currency code for the Indonesian rupiah is IDR. The name "rupiah" is derived from the Sanskrit word for silver, rupyakam (रूप्यकम्). Informally, Indonesians also use the word "perak" ("silver" in Indonesian) in referring to rupiah. The rupiah is divided into 100 sen, although inflation has rendered all coins and banknotes denominated in sen obsolete.
Introduced in 1946 by Indonesian nationalists fighting for independence, the currency replaced a version of the Netherlands Indies gulden, which had been introduced during the Japanese occupation in World War II. In its early years, the rupiah was used in conjunction with other currencies, including a new version of the gulden introduced by the Dutch.