1) Blinds 2) Closes 1) Covers for windows 2) Storm protectors 3) Window treatments 
Pairs of solid or slatted window coverings, traditionally hinged to the exterior of a building to either side of a window, used to block light or wind from the interior of a building.
Protections for windows. They may be hung like doors, balanced like sliding sashes or built up of laths to wind round a roller.
Adjustable blades, inserted into the focal plane of a luminaire, used to adjust the beam in profile instruments. See also barndoors.