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The greenhouse of a vehicle refers to the part of its body above the fender- or beltline, so called because it comprises mostly areas with glass: the windshield, side, and rear windows (or backlight), and sometimes also roof glass. These glassed areas are also known collectively as the car's daylight opening (DLO). To distinguish the greenhouse from DLO, the greenhouse is a superset which also includes the metal structures above the beltline: in general, these include the roof and all pillars separating the glass and upholding the roof.[1][2]