Twelver Shi'i Islam is totally dominating the Iranian society, not only as creed, but also with its impact on the political system.
Although Iran political structure is a republic system, it may seem different from other similar political systems. Iran political system's origin and roots are the reason beyond such a uniqueness.
The currency in Iran, or the money used, is called the rial (pronounced ‘reeyaal’). The rial is like the dollar or a pound in that is made up of 100 pieces, in Iran called dinars. However, due to high inflation one riyal is worth so little that no fraction of it is really used on a day to day basis.