Rials is the official term used for Iran's national currency (abbreviated IRR), but people prefer to use the word Toman instead of Rial as if it were a different currency (it is not). Each Toman represents 10 Rials. For example, a piece of bread may cost 500 Rials, but a person will say conversationally, "The bread costs 50 Toman".

As of February 4, 2013, $1.00 USD = 12,282.00 IRR.
The currency used in Iran(which is a purely cash economy) is Iranian rial.
The Iranian currency is the Iranian Rial, or IRR, worth approximately $0.0000959877 US Dollars.