Notchback

[3] The category may be characterized as having a three-box design where the trunk volume is less pronounced than the engine and passenger compartments.

[5][6][7] In a major design change among U.S. automakers for the 1952 model year, a notchback version of the Nash Ambassador was introduced.

[8][9] This was in contrast to the previous fastback aerodynamic body shape that made the 1949 through 1950 Nash Ambassadors the "most streamlined form on the road.

"[10] The new cars had a distinctive reverse slanting C-pillar and featured boxier styling that became a design trend.

[15] While many car models have notchback characteristics, the category is largely unused outside North America, with their body style being described using other terms.