Trefoil
Artistic representation of three circular leaf shapes used in architecture
Trefoil
A trefoil (ultimately from Latin trifolium 'three-leaved plant', via Old French trifoil) is a graphic form composed of the outline of three overlapping rings, used in architecture, Pagan and Christian symbolism, among other areas. The term is also applied to other symbols with a threefold shape. A similar shape with four rings is called a quatrefoil.
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