angle of reflection is a noun meaning "the angle between a reflected ray and a line perpendicular to the reflecting surface at the point of incidence". It carries one recorded sense.
the angle between a reflected ray and a line perpendicular to the reflecting surface at the point of incidence
Definitions, synonyms and semantic relations for angle of reflection come from Princeton University’s WordNet. Commonness is measured against a corpus of everyday English. Full sources and licences.