
1) Gothic architecture
Found on
https://www.crosswordclues.com/clue/hexafoil

A hexafoil is a traditional element of Gothic architecture, created by overlapping six circular arcs to form a flower-like image. One common form of the hexafoil has a ring of six tangent circles circumscribed by a larger circle. It may be constructed by compass and straightedge, by drawing six circles at the centers of a regular hexagon, with dia...
Found on
http://en.wikipedia.org/wiki/Hexafoil

A six lobed structure. In Armenia, such buildings often use the six walls to support a dome. See also: quatrefoil, trefoil.
Found on
http://www.virtualani.org/glossary/index.htm
No exact match found.