The Iranian toman (Persian: تومان , romanized: tomān, pronounced ; from Mongolian tomen ‘unit of ten thousand’, see the unit called tumen) is a superunit of the official currency of Iran, the rial.One toman is equivalent to ten rials. Although the rial is the official currency, Iranians use the toman in everyday life. Originally, the toman consisted of 10,000 dinars.