The U.S. dollar is the currency most used in international transactions. Several countries use the U.S. dollar as their official currency, and many others allow it to be used in a de facto capacity. It's known locally as a buck or greenback.
The Real, meaning 'royal, was first introduced by Portugese settlers and became Brazil's official currency in 1690. It was not sub-divided in smaller units. The modern real (plural reais) was introduced on July 1, 1994.
Eurozone Euro Swiss Franc Czech Koruna Danish Krone Pound Sterling Hungarian Forint Icelandic Krona Norwegian Krone Polish Zloty Russian Rouble Swedish Krona
Canadian Dollar Mexican Peso United States Dollar
Argentinian Peso Brazilian Real Chilean Peso Venezuelan Bolivar East Caribbean Dollar
Arab Emirates Dirham Chinese Yuan Hong Kong Dollar Indian Rupee Israeli Sheqel Japanese Yen South Korean Won Philippine Peso Pakistani Rupee Saudi Riyal Singapore Dollar Thai Baht Turkish New Lira