Originally Posted by JCL

Coupé comes from the French word for 'cut', indicating that the vehicle seating is close-coupled. That usually implies two doors, but it always means a smaller rear seat volume. That translates as less rear leg room, and less headroom, the latter resulting in a sportier exterior roof line.

That, and the fact that when you invent a marketing label such as SAC you get to call yourself the market leader for a year or so.