Plural of halo; circles of light around a head (like in religious art) or rings of light around a bright object like the sun or moon.
From Greek 'halos' (originally meant salt or salt crystallization, but came to mean a circular form or disk). The meaning shifted to 'ring of light' in medieval religious art.
The halo in religious paintings actually comes from the same Greek word for salt—medieval artists were depicting enlightenment as a 'crystalline perfection' around holy figures!
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