Foil, (lat. folium, fr. feuille), but borne only in compounds.
Unifoil: a charge which probably never existed anywhere but in the fancy of Randle Holme, who says that it is like a single leaf of the trefoil. The twyfoil no doubt derived its origin from the same or a similar source. Under their heads are given Trefoil, Quatrefoil, Cinquefoil, Sexfoil.