The term IRAN CURRENCY can be solved by two different crossword solutions: RIALS (5 letters) and RIAL (4 letters). The official currency of Iran is the Iranian Rial, which is divided into 100 smaller units called dinars. The Iranian Rial has been the official currency of Iran since 1932, replacing the Persian qiran. The Iranian Rial is also known as the Iranian Toman, with one toman equal to 10 rials.