noun
retroreflection
Technical term in physics and optics for the phenomenon where light or other radiation is reflected back to its source with minimal scattering.
再帰反射素材は夜間の交通安全に役立つ。
Retroreflective materials help with nighttime traffic safety.
Reflection in general; 再帰反射 specifically refers to reflection back toward the source.
Compound of 再帰 (recursion, return) and 反射 (reflection), likely a calque from English 'retroreflection'.