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The Messerschmitt KR200, or Kabinenroller (Cabin Scooter), was a three-wheeled bubble car designed by the aircraft engineer Fritz Fend and produced in the factory of the German aircraft manufacturer Messerschmitt in the 1950s and early 1960s.

The KR200 replaced the KR175 and was an almost total redesign whilst retaining the original concept. The most noticeable thing about the KR200 "limousine" model is its distinctive bubble canopy. These were usually transparent acrylic ("Plexiglas" or "Perspex"), though reproductions are car-safe polymethyl methacrylate. Three-wheeled, low to the ground, and sporting two perfectly round headlights, these cars were unusual, even by the standards of microcars. The KR200 ran on a one cylinder two-stroke air-cooled motorscooter engine, which was in front of the rear wheel, just behind the passenger's seat. It had very simple controls, including a steering bar reminiscent of that of an aircraft. A convertible or "Cabriolet" model was also made which had a roll-down hood directly replacing the Perspex dome.

http://en.wikipedia.org/wiki/Messerschmitt_KR200