A punner is a type of pile-driver, used to tamp and harden the dirt (e.g., around a fence post); the term is the English translation of Rammbock, the German name for the charge. It’s a period charge, found in the arms of von Auffhaim or von Aufheim, c.1450 [Scheibler 297], and of von Lintzer, mid-16th C. [NW 32]. The punner is palewise by default.
Cormac Mór bears as a badge: A punner Or.
Violet Hughes bears: Purpure, a punner argent.