Karambit (5e Equipment)
From D&D Wiki
Simple Melee Weapons
A short dagger that is curved to resemble a hooked claw. Originally developed as a farming tool, the blade became longer and more curved as it became a martial weapon.
Special. The hole at the end is for the user to loop a finger through to improve grip, let it act as an iron knuckle, and make it difficult to disarm. Thus you have advantage against disarming action or effects oppose onto you or you gain advantage to disarm an opponent.