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louvre
spill shield
louver, US
screen made of translucent or opaque components and geometrically disposed to prevent electric lamps from being directly visible over a given angle
Note 1 to entry: This entry was numbered 845-10-38 in IEC 60050-845:1987.
Note 2 to entry: This entry was numbered 17-699, 17-1247, and 17-697 in CIE S 017:2011.