DXO, the PowerShares DB Crude Oil Double Long ETN tracks the price of the Deutsche Bank Liquid Commodity index - Optimum Yield Oil Excess Return. The oil ETN gives investors the opportunity to take a position in the performance of crude oil. The ETN consists of futures contracts on light sweet crude oil.
If you'd like to see more related funds, here is a thorough list of oil ETFs. A List of Major Oil ETFs and ETNs
Or if you are more interested in energy investments, here is a List of Energy ETFs.

