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A halo (also known as a nimbus or Gloriole) is a ring of light that surrounds an object. They are often used in religious works to depict holy or sacred figures. In Christian sacred art (Eastern and Western churches), holy persons (saints) are depicted with a halo, a golden, yellow or white circular glow, around the head
Halos, also known as icebows, are also optical phenomena that appear near or around the Sun or Moon, and sometimes near other strong light sources such as street lights. There are many types of optical halos, but they are mostly caused by ice crystals in cold cirrus clouds located high (5-10 km, or 3-6 miles) in the upper troposphere. The particular shape and orientation of the crystals is respons ible for the type of halo observed. Light is reflected and refracted by the ice crystals and may split up into colors because of dispersion, similarly to the rainbow.