A crescent-shaped figure, often formed by two overlapping circles; can also mean a crescent-shaped decorative object.
From Latin 'luna' (moon), referring to the moon's crescent shape. The term is used in geometry, astronomy, and heraldry to describe crescent-shaped forms.
In mathematics, lunes are bizarrely cool—the ancient Greeks proved that you can create a lune with the exact same area as a triangle, one of the earliest examples of 'squaring' a curved shape!
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