These arcs (arches) are quite common in Moorish architecture, as can be seen in this picture, made in the Mezquita in Córdoba.
A less intricate form has been used in Cluny in the wall of 2 Place Notre Dame.
The arch in this picture is an arc trilobé (trefoil arch); there are also varieties called arcs quintilobé (with 5 foils), etc.
See also lobe.
|Mezquita - Córdoba|
|2 Place Notre-Dame - Cluny|