The arm represents physical strength and the capacity for powerful action. In biblical usage, especially in Old Testament citations, the 'arm of the Lord' is a frequent metaphor for God's mighty power displayed in salvation and judgment. Mary's Magnificat celebrates how God 'has shown strength with his arm.' The term evokes images of deliverance, military might, and sovereign intervention. When applied to God, the arm is anthropomorphic language emphasizing His active power to save and judge.