noun

• Something which reflects heat, light or sound, especially something having a reflecting surface.
• A reflecting telescope.
• A small, often red, reflecting disk on the rear of a vehicle or bicycle that reflects the headlights of other vehicles.
• A safety reflector.
• One who reflects on something; one who thinks or considers at length.
• (cellular automata) A pattern which can change the direction and/or offset of an oncoming spaceship without being destroyed.