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sixfoil

ˈsixfoil Arch. and Her.
  [f. six, after quatre-, cinquefoil.]
  An ornamental design (or opening) having the form of six leaflets or petals radiating from a common centre.

1849 Ruskin Sev. Lamps ii. §21. 53 The double sub⁓arch decorated..with quatrefoils, sixfoils, and septfoils, in the transept towers of Rouen. 1864 [see cinquefoil n. 2 b]. 1864 Boutell Her. Hist. & Pop. xv. 194 In early blazoning but little difference appears to have been recognized between sixfoils and roses.

Oxford English Dictionary

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