pheon

from The Century Dictionary.

• noun A barbed javelin formerly carried by the royal ser-geant-at-arms.
• noun In heraldry, a barbed head, as of an arrow or a fish-spear, differing from the broad-arrow in being engrailed on the inner side of the barbs unless otherwise blazoned. The point is always directed downward unless otherwise stated in the blazon. Also called ferrum jaculi. Compare broad-arrow.

from the GNU version of the Collaborative International Dictionary of English.

• noun (Her.) A bearing representing the head of a dart or javelin, with long barbs which are engrailed on the inner edge.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• noun heraldry A bearing representing the head of a dart or javelin, with long barbs which are engrailed on the inner edge.