reflector

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.

反射器

反射镜

A safety reflector.

One who reflects on something; one who thinks or considers at length.

Something that is reflective (indicative) of something else.

A pattern which can change the direction and/or offset of an oncoming spaceship without being destroyed.