United States dollar

From CharityScorecard

United States dollar (USD or US$) 

The dollar is a unit of currency in the US. Within the US, dollar figures are is commonly abbreviated using the $ symbol, but the $ symbol can be ambiguous because different dollars are used as units of currency in many countries. The Charity Scorecard site also has pages which include figures in International Dollars (Int$). To avoid confusion, we've tried to avoid using the $ symbol by itself, and instead use US$, USD, or Int$. See also: http://en.wikipedia.org/wiki/United_states_dollar