retroreflection
/ˌrɛtroʊrɪˈflɛkʃən/
noun
- The reflection of light back toward its source, especially from a surface designed to do this.
- Safety vests rely on retroreflection to make workers stand out in low light.
- The retroreflection from the road signs makes them visible at night when headlights shine on them.
- Bicycle reflectors use retroreflection to help drivers see cyclists in the dark.