The Assigned Sentinels are co-ordinating personalities and liaison representatives of the Seven Supreme Executives. They were personalized on Paradise by the Infinite Spirit and were created for the specific purposes of their assignment. They are of stationary numbers, and there are exactly seven billion in existence.  They are the representatives of superuniverse Supreme Executives to local systems.  Sirven in rotation. 
They are responsible solely to the Supreme Executive of the superuniverse concerned; their activities are distinct from the administration of the Ancients of Days.  They are the advisers to local systems in light and life. 
In the local systems they serve as the ex officio heads of the four and twenty administrators hailing from the evolutionary worlds, but otherwise, ascending mortals have little contact with them.  They appear in personality registers.  Omniaphim are the personal representative of Assigned Sentinels in planets in light and life.  The Associate Inspectors receive reports and recommendations only from their subordinates, the Assigned Sentinels. 
See also: UB 24:5.