What does the head on the neck of Nezha's knife rest mean?

The head image on the neck of Nezha's tool rack shows Nezha's bohemian character and his belief of not sticking to secular ideas. Nezha is an upright, rebellious, filial and hateful person. He is a representative figure who opposes the oppression of feudal power and is a leader among all righteous immortals. Nezha is deeply loved by people because of his young image and exuberant energy.