Atrefoil arch, orthree-foiled cusped arch (occasionallytrilobite arch, no connection to an actualtrilobite), is anarch incorporating the shape or outline of atrefoil – three overlapping circles.[1] It has been widely used for itssymbolic significance in Christian architecture.[citation needed] Trefoil arches are common inGothic architecture forportals and decoration.[1] Trefoil or "trilobed" arches are also a characteristic feature of decoratedportals in lateFatimid architecture andMamluk architecture in Egypt, from approximately the 12th to 16th centuries.[2]: 191 [3]: 89
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