It seems like we should call Thamar's mark a swastika, since the word "swastika" comes from the sanskrit word for this mark, while "Fylfot" is a term used by british heraldry for this mark???
One of my Thamar khukuris (one of the recent discounted Yek chirras without a sheath) has the arms on the mark angled to the left, rather than to the right, so I guess it depends on which way he's holding the blade when he marks it, or on some other reason? Or could there be a mirror-image twin Thamar that does everything in reverse?