A stylized depiction of the serrated triangular leaf of a nettle. Nettles are often covered by tiny hairs that act as needles that produce a stinging sensation if touched. Plural is “nesselblätter.”
Default orientation: one large point to base. No proper coloration.
Source: Sammelband Mehrerer Wappenbücher. Artist unknown. Adapted by Mathghamhain Ua Ruadháin.