US Dollar Index (USDX)
The USDX is a measure of the value of the United States Dollar against six global currencies: the euro, Swiss franc, Japanese yen, Canadian dollar, British pound, and Swedish krona. If the USDX is rising then the USD is likely rallying against most of the other currencies. The USDX also has some known relationships with commodities like Gold and Oil. Generally, Dollar weakness is accompanied by rising commodity prices and vice versa.