[Christ]

This version of spoiler as shown on the back of the Honda Civic Hatchback (as posted by thebrad)

Is actually more commonly referred to as a "brow" spoiler... the lower counterpart to it is referred to as a "duckbill" Mugen makes them for those cars. (that's the stock one pictured, there is another one that goes just above the tails and wraps around the rear at the lower edge of the glass. (these cars have a tailgate, and a hatch window.. the metal part folds down, the glass goes up.))

They're essentially worthless for aero, they help to keep the car attached to the road... not so much to keep airflow attached to the car.