The Aramaic word arkkubah (אַרְכֻּבָה) means knee and appears in the Aramaic sections of the Old Testament, specifically in Daniel 5:6. This word is the Aramaic equivalent of the Hebrew berek (H1290). The knee is used throughout Scripture as a powerful symbol of worship, submission, fear, and reverence — whether bowing before God or trembling before a king.
Bowing the knee in Scripture represents total submission and acknowledgment of supreme authority. The promise that "every knee will bow" before God (Isaiah 45:23) is picked up in the New Testament and applied directly to Jesus Christ (Philippians 2:10), establishing His divine lordship. In Daniel 5, King Belshazzar's knees knocked together in terror at the divine handwriting on the wall, a physical response to the sudden awareness of divine judgment. The posture of the knees — bowed or trembling — reveals the condition of the heart toward God.