The item is a Tibetan Phurba (or kīla in Sanskrit), a ritual dagger used in Indo-Tibetan Buddhism.
It is a three-sided peg or stake used to conquer evil spirits and destroy obstacles.
The three-sided blade symbolizes the overcoming of the "triple poisons" of ignorance, greed, and delusion.
It is used in tantric rituals for purification, protection, and dispelling negative energies.
Though it has the appearance of a dagger, its purpose is not to inflict physical harm but to serve as a spiritual instrument.
The hilt of this specific phurba features decorative skull and a dorje at the top, which are common symbolic elements in these ritual objects