
A trefoil arch, or three-foiled cusped arch (occasionally trilobite arch, no connection to an actual trilobite), is an arch incorporating the shape or outline of a trefoil – three overlapping circles. It has been widely used for its symbolic significance in Christian architecture.[citation needed] Trefoil arches are common in Gothic architecture for portals and decoration. Trefoil or "trilobed" arches are also a characteristic feature of decorated portals in late Fatimid architecture and Mamluk architecture in Egypt, from approximately the 12th to 16th centuries.: 191 : 89
Trefoil arches were the most prominent feature of medieval Kashmiri temple architecture. The combination of trefoil arches with triangular pediments was unique to Kashmir between the 7th and 13th centuries.