 the iranian rial (in persian: Ø±ÛØ§Ù Ø§ÛØ±Ø§Ù ; iso 4217 code irr) is the currency of iran and, as of 2014, remains the world's least valued currency unit.http://www.nationmaster.com/graph/cur_lea_val_cur_uni_exc_rat_to_1_us_dol-exchange-rate-1-us-dollar the name derives from the portuguese real (meaning royal in portugal), which was for several centuries the currency in portugal (derived from latin regalis [regal]). although the "toman" is no longer an official unit of iranian currency, iranians commonly express amounts of money and prices of goods in "tomans." for this purpose, one "toman" equals 10 rials. despite this usage, amounts of money and prices of goods are virtually always written in rials. for example, the sign next to a loaf of bread in a store would state the price in rials, e.g., "10,000 rials," even though the clerk, if asked, would say that the bread costs "1,000 tomans.". there is no official symbol for the currency but the iranian standard 
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