http://en.wikipedia.org/wiki/Coup%C3%A9

Quote:

Coupés are often hardtopped sports cars or sporty variants of sedan (also known as saloon — see American and British English spelling differences) body styles, with doors commonly reduced from 4 to 2, and a close-coupled interior (i.e. the rear seat placed further forward than in a standard sedan) offering either two seats or 2+2 seating (space for two passengers in the front and two occasional passengers or children in the rear).

Alternatively, a coupé is distinguished from a two-door sedan by the lack of a "B" pillar to support the roof. Sedans have an "A" pillar forward at the windscreen, a "B" pillar aft of the door, and a "C" pillar defining the aftermost roof support at the rear window. Thus with all side-windows down, a coupé would appear windowless from the "A" to the "C" pillars. These fixed-roof models are described as a hardtop. Targa top models are a variation on the convertible design.