The Iranian toman (Persian: تومان, pronounced [tomɑn]; from Mongolian tümen "unit of ten thousand", see Tumen (unit)) is a superunit of the official currency of Iran, the rial. It was divided into 10,000 dinars. Between 1798 and 1825, the toman was also subdivided into 8 rial, each of 1250 dinar. In 1825, the qiran was introduced, worth 1000 dinars or one tenth of a toman.
In 1932, the rial replaced the toman at a rate of 1 toman = 10 rials (i.e., 1 rial = 1 qiran). Although the rial is the official currency of Iran, Iranians employ the term 'toman', meaning 10 rials.
On 7 December 2016, the Iranian government approved a call by the central bank to replace the country's rial currency with the more colloquially and historically known toman denomination. If the Iranian parliament votes to approve the measure, Iran's currency will change its name and value after nearly eight decades.
Iranian toman Wikipedia
Iranian gold coins were denominated in toman, with copper and silver coins denominated in dinar, rial or qiran. During the period of hammered coinage, gold toman coins were struck in denominations of ¼, ½, 1, 2 and 10 toman, and later 1⁄5, 3 and 6 toman. With the introduction of milled coinage in AH1295, denominations included 1⁄5, ½, 1, 2, 5, 10, and 25 toman. The last gold toman were issued in 1965, well after the toman had ceased to be an official Iranian currency.