line excluding the engine hood. The opposite of the fender is the "quarter panel". Fishtail Exhaust A car or motorcycle exhaust tip with the sides forming a tapering design- either horizontal or vertically aligned - often made to look like the tail of a fish . "Koenigsegg Regera" uses a modern example of this design. These were made popular in the 1920's by their implementation in the Brooklands silencer which were necessitated by the noise regulations at the Brooklands race track. Frame-on-rail Also known as body-on-frame. A design used in older (pre-unibody) cars, trucks, and SUVs. The power train and body are mounted to a rigid structural vehicle frame, also known as a rail, and the body is a distinct structure that is mounted to the frame. In some cases, the distinction between a body-on-frame and unibody construction are blurred; for example, subframes could be used to carry suspension components, or the body could be a separate module, such as the case of the BMW i3. G Gill A vent on the side of the fender that can be used as hot-air outlet, but usually decorative. Greenhouse The glassed-in upper section of the car's body. Daylight Opening (DLO) in turn describes the actual window areas only. Gull-wing door Car doors that are hinged at the roof rather than the side, as pioneered by the 1952 Mercedes-Benz 300SL race car. Opening upwards, the doors evoke the image of a seagull's wings. H Hardtop A coupe or sedan lacking a center window post between the front windshield post and the rearmost window post or body section. Header The structural roof beam above the windshield. Alternatively, header can refer to the section of exhaust piping attached to the cylinder head. Hofmeister kink BMW's trademark reverse-sweep kick at the bottom of last roof pillar. H-point (or HP (Hip Point)) The pivot point between the torso and upper leg portions of the body, either relative to the floor of the vehicle[1] or relative to the height above pavement level, as used in vehicle design. Hood The engine cover on vehicles when the engine is located forward or aft of the passenger compartment. Also known as a bonnet in English speaking countries outside North America with the exception of the Canadian Maritimes HVAC Heater, ventilation and air condition. A major package constraint both technically as well in interior design. I IP Instrument Panel. The dashboard is