The Iranian Rial is the official currency of Iran. It is also known as the IRR, which stands for Iranian Rial, or the Persian Rial. Other colloquial synonyms for the Iranian Rial include Tomans, Zenj, and Mazuna. The Toman is a unit of currency used informally in Iran, where 1 Toman is equal to 10 Rials. Zenj is a term used to refer to coins used in Iran before the introduction of paper currency, while Mazuna refers to the silver coins that were used as currency in Iran during the Safavid dynasty. Despite the varying names, the Iranian Rial remains the official currency of Iran and is widely used for transactions within the country.