I really like this and think it would be a sick tattoo on the inner wrist. The word valknut is a neologism: it is formed in modern times through combination of ON valr, ‘the dead’ or ‘the slain’ and knut, ‘knot’.
twinmonkeytattoo: “ Platonic Solid In three-dimensional space, a Platonic solid is a regular, convex polyhedron. It is constructed by congruent regular polygonal faces with the same number of faces meeting at each vertex. Five solids meet those.