Agents of STRIKE
The first time the Exploration Corps defeated a Council Executor, we were able to obtain a data listing of “Earth Designations”.
Apparently the Council designates parallel universes numerically in sequence. Obtaining a ledger of these sequences from the Executor’s databank before we were forced to relinquish it, we learned that our own Earth is designated Earth-1491.
This ledger has served as the foundation of our frequency attuning system for the Holepunch, and as a result also is the numbering system for universes we visit.