fret

The fret is a striking charge, often occupying the whole of the field and being two instersecting diagonal lines interlaced with the outline of a square. A Glossary of Terms used in British Heraldry, J.H. Parker, Oxford, 1894, Entry:Fret It is believed to be derived from the image of a fishing net, which it does indeed resemble, and hence Wade believes that it should signify persuasion, although other writers regard it separately as the “the heraldic true lovers knot” The Symbolisms of Heraldry, W. Cecil Wade, George Redway, London, 1898 P118