crow's_beak
A medieval polearm similar to a halberd or Lucerne hammer, but across the shaft from the hammer, there is a pointy, slightly-hooked spike. This spike was mostly used for hooking an opponent's weapon or limb. The name comes from the French, "bec de corbin," which literally means "crow's beak."
http://en.wikipedia.org/wiki/Bec_de_corbin