Valknut ; from w:Image:TangelgardaOdin.jpg Information from the English page: Extract from Bildsten_-_Historiska_museet-DIG_56410.jpg Similar is https://www
trefoil knot. Found in early medieval Germanic inscriptions (see TangelgardaOdin.jpg). See also Valknut-Symbol-borromean.svg and Valknut-Symbol-3linkchain-closed