The Phurpa is a ritual object rather widespread in Asian countries that have been influenced by Tibetan. Sometimes called "dagger sacred" the Phurpa was used in rituals by high level tantric practitioners, to fight evil spirits and to destroy obstacles.

Steel can be defined as an iron-carbon alloy with a carbon content less than 2.06%. In practice, however, other elements are always present in non-negligible quantities, so to constitute a complex alloy.