光环 (guāng huán) literally means 'light ring'—'光' (guāng) means 'light' and '环' (huán) means 'ring' or 'circle'. In its literal sense, it refers to the luminous ring sometimes seen around the sun, moon, or a person’s head in religious or artistic depictions—what English calls a 'halo'. However, its more common modern usage is metaphorical: it describes an intangible 'aura of prestige, admiration, or idealized reputation' surrounding a person or thing, often due to fame, success, moral virtue, or romantic idealization.

This figurative meaning is widely used in media, literature, and everyday speech. For example, celebrities, revered teachers, or even beloved historical figures are said to have a 'glowing halo'—suggesting others view them with uncritical respect or romanticized awe. The term can carry neutral or slightly critical connotations, especially when the 'halo' obscures flaws or creates unrealistic expectations.