Pommel

[Sarah]

A knob or ball; an object resembling a ball in form; as:(a) The knob on the hilt of a sword. Macaulay.(b) The knob or protuberant part of a saddlebow.(c) The top (of the head). Chaucer.(d) A knob forming the finial of a turret or pavilion.

[Sarah]

To pound back and forth, usually with ones member.

[Rihanna]

A rounded knob on the end of the handle of a sword, dagger, or old-fashioned gun.