mascle
The mascle is a close relative of the lozenge or diamond shape, but with the centre cut away revealing the background underneath. A Glossary of Terms used in British Heraldry, J.H. Parker, Oxford, 1894, Entry:Mascle. Guillim, writing in the 17th century reckoned the mascle to represent the mesh of a net, being the biblical symbol for “persuasion, whereby men are induced to virtue and verity”. A Display of Heraldry, J. Guillim, Blome, London, 1679, P234