pheon
Also 5 feon.
[Origin unknown.
Identity has been suggested with OF. foine, foene, mod.F. fouine, a pitchfork, or trident for catching fish, etc., the regular Eng. repr. of which is foin; but the pheon is never a fork, and the fouine is not essentially barbed.]
1.1 Her. ‘A charge representing a broad barbed arrow, or head of a javelin’ (Fairholt). Either identical with the figure called the broad arrow, or differing only in being engrailed on the inner edge.
Oxford English Dictionary