This currency is among the world’s dominant reserve currencies and is most used in international transactions. Abbreviated as US$, United States dollar is the official currency of the United States ... more 
This currency is among the world’s dominant reserve currencies and is most used in international transactions. Abbreviated as US$, United States dollar is the official currency of the United States of America. It is divided into 100 smaller units called cents and Greenback is the nickname of the currency.

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Yahoo Finance India
Fri, Dec 21, 2012 7:00 AM AST (Arabian)