Did you ever play with slinkies as a kid? For those unfamiliar with memory wire bracelets, they are essentially steel slinky rings you can bead and wear as multi layered jewels.
They may not call the Phurba a weapon, but in fact, it is a guardian against evil spirits. It is a three-headed dagger protecting you from all angles. The Phurba has been used in Tibetan tradition for centuries.