Window deflector

A window deflector is mounted above the doors of some automobiles, to protect the inside of the car from rain or other precipitation in case of slightly opened windows. Deflectors may also be fitted to sunroofs to change the flow of air.
Types.
Based on the way wind deflectors are installed, they may be classified as follows:
Similar equipment.
Hood protector.
A hood protector or bug guard is a similar look product which is supposed to protect the car paint against insects.
Rear window louvers.
Rear window louvers or rear window blinds (German "Heckjalousie" or "Heckscheibenjalousie") is a type of window blind which can be mounted to the rear window of a car. It is supposed to make the window get less dirty as well as hinder bothersome sunlight from entering through the rear window, but has been criticized by at least one car expert as a fashion phenomena with little practical use. In 1966, Lamborghini Miura became one of the first production cars that came with rear window louvers.