UCO, the Ultra DJ-AIG Crude Oil ProShares ETF tracks the Dow Jones AIG Crude Oil Sub-Index, but seeks to do so at twice the rate. The oil ETF consists of assets with economic characteristics to meet the twice the return of the crude oil index.
If you'd like to see more related funds, here is a thorough list of oil ETFs and ETNs.
Or if you are more interested in energy investments, here is a List of Energy ETFs.

