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’.
Know your Vegvisirs. I was drawing these, wondered why the different versions around the place. Nobody can figure out what Björks tattoo actually is, a Galdrabók one roughly done most likely vegvisir symbol