Also referred to as the Dollar, Greenback and Buck.
The US Dollar was adopted by the Congress of the Confederation of the United States on July 6, 1785 and is the 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.
In 1995, over US$380 billion were in circulation, of which two-thirds was outside the United States. By 2005, those figures had doubled to nearly $760 billion with an estimated half to two-thirds being held overseas, which is an annual growth of about 7.6%. However, as of December 2006, the dollar was surpassed by the euro in terms of combined value of cash in circulation. The value of euro notes in circulation has risen to more than € 610 billion, equivalent to US$800 billion at the exchange rates at this time.
The U.S. dollar uses the decimal system, consisting of 100 (equal) cents (symbol ¢).