Halo (noun)

1. A circle of light around the sun or moon, caused by the refraction and scattering of light by ice crystals in the atmosphere.
2. A circle of light or radiance surrounding the head of a saint or holy person in art.

Origin:

From latin halo ("disc of light, nimbus"), from greek ἅλως (hálōs, "threshing floor, disc of the sun or moo.n")

Examples:

1. The halo around the sun was caused by the ice crystals in the air.
2. The halo around the moon was visible only during certain weather conditions.
3. The halo is a symbol of holiness and divinity.
4. The painting depicts the saint with a golden halo around his head.
5. The halo effect is the tendency to believe that people or things that are considered good in one area are also good in other areas.