root autonomic identifier
Definition
An entity may provide the root-of-trust for some ecosystem (with delegation )via its root AID. Let’s call this the RID for "root AID". The RID must be protected using the highest level of security in its key management. Although through the use of a multi-valent key management infrastructure, the entity can employ extreme protection of the RID while still enabling more performant key management infrastructure for its operations.
Source Universal Identifier Theory by Samuel Smith