Something that emits or reflects light

A signal that is clear or easily understood

स्पष्ट संकेत

English Usage: The luminous signal in his explanation made the complex concept easier to grasp.

Hindi Usage: उसकी व्याख्या में स्पष्ट संकेत ने जटिल अवधारणा को समझने में आसान बना दिया।