Anti-gravity belt
From Halopedia, the Halo wiki
The Antigrav Belt is a device worn by lesser Prophets of the Covenant. Less advanced and less ornate than the High Prophets' Gravity Thrones, Antigrav Belts are worn around the waist of the Prophet. They serve to keep the Prophet levitating for two reasons; One, so that they do not need to walk and two so that they can look down upon their lesser commanders, even the Elites. This is another way they display their power in the Covenant.
