Final answer:
The action/essential sign for Anointing of the Sick in the Christian tradition is the laying on of hands.
Step-by-step explanation:
The action/essential sign for Anointing of the Sick in the Christian tradition is the laying on of hands. This ritual is used as a means of conveying the Holy Spirit and as an act of healing by Christ. The belief is that through physical contact and fervent prayer, the Holy Spirit can move from one individual to another, strengthening, healing, and anointing them with God's grace.