The Collaborative International Dictionary of English v.0.48:

Fyllot \Fyl"lot\, n. [Prov. fr. AS. fy?erf?te, fierf?te,
   fe['o]werf?te. See Four, and Foot, n.]
   A rebated cross, formerly used as a secret emblem, and a
   common ornament. It is also called gammadion, and
   swastika. Fyrd