The word 闪光 is formed by combining two characters: 闪, which depicts a person under a doorway and conveys the idea of "darting in and out" or "flashing", and 光, which represents "light" or "brightness". Together, they create a vivid conceptual image where the action of flashing or sparkling is directly applied to light itself, resulting in the meaning of a "flash of light", "glint", or "sparkle". It is a direct, almost pictorial compound where the first character describes the action and the second defines the substance.