A Sedan, Hardtop, Post, Pillar, etc all refer to a car which doesn't have flow-through side windows. Meaning, if you open the door, and roll down the window, there will be a frame for the window still there.
A Sport Coupe doesn't have the frame. The door, with the window down, will not have the frame. it'll look like that of a convertible.
Hey let's not forget SPORT SEDANS! If you've ever seen a Chevelle Sport Sedan, it's quite interesting. Four doors, but no posts! Glass all the way. Only thing that separates the front and rear door windows is the thin chrome/weatherstrip piece.
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