Reflector

A component of a solar energy facility that reflects incident sunlight to a desired location or component within the facility, allowing it to be converted to other useful forms of energy, typically heat.

In an rf antenna, one or more conducting elements or surfaces that reflect incident radiant energy. Note: A reflector may consist of a large surface, as in a dish antenna, or a linear element, as in a Yagi antenna. 2. See mail reflector.