In architecture, a foil (from Latin folium 'leaf') is a type of decorative element based on a symmetrical rendering of leaf shapes, defined by overlapping circles of the same diameter that produce a series of cusps to make a lobe. Typically, the number of cusps can be three (trefoil), four (quatrefoil), five (cinquefoil), or a larger number (multifoil).
In architecture, a foil (from Latin folium 'leaf') is a type of decorative element based on a symmetrical rendering of leaf shapes, defined by overlapping circles of the same diameter that produce a series of cusps to make a lobe. Typically, the number of cusps can be three (trefoil), four (quatrefoil), five (cinquefoil), or a larger number (multifoil).
Source: Wikipedia "Foil (architecture)" · CC BY-SA 4.0
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