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reflector US English

A piece of glass, metal, or other material for reflecting light in a required direction, e.g., a red one on the back of a motor vehicle or bicycle

reflector antenna US English

A type of antenna containing a reflector to reflect electromagnetic waves, widely used in the fields of telecommunications, remote sensing, and radio astronomy.

retroreflector US English

A device that reflects light back along the incident path, irrespective of the angle of incidence