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retroreflection
reflection in which the reflected rays are preferentially returned in directions close to the opposite of the direction of the incident rays, this property being maintained over wide variations in the direction of the incident rays
Note 1 to entry: This entry was numbered 845-04-92 in IEC 60050-845:1987.
Note 2 to entry: This entry was numbered 17-1104 in CIE S 017:2011.