Valknut

From Metapedia

The Valknut (Old Norse valr, slain warriors + knut, knot) is a symbol consisting of three interlocked triangles. The symbol appears on Scandinavian rune stones in connection with Odin. The name of the symbol is an unattested modern invention used to describe the image and was not used contemporaneously when the symbols were carved.

The symbol appears in a unicursal form, e.g. on the 7th century Tängelgarda stone from Gotland, and in a tricursal "brunnian linked" form, such as on the Lärbro stone, also in Gotland, as well as upon a ring found in the River Nene in England and on the Oseberg ship from Stagen, Norway. The only traditionally and historically attested forms found so far have been the Borromean tricursal, and the triquetra unicursal.