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United States dollar (sign: $; code: USD) is the unit of currency of the United States. The U.S. dollar is normally abbreviated as the dollar sign, $, or as USD or US$ to distinguish it from other dollar-denominated currencies and from others that use the $ symbol. It is divided into 100 cents (200 half-cents prior to 1857).

The U.S. dollar is the currency most used in international transactions.[1] Several countries use it as their official currency, and in many others it is the de facto currency.[2]
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