[Valthira Arkayne]

He's a VERY skilled player and he knows about the facility designations. He's probably played 50 or more games and has been a regular opponent of mine for a year. We're playing a more extended game than usual and I assumed it was some sort of hidden technology I have yet to experience.

However, it's possible he's marking worlds by renaming them for some other internal purpose I have yet to discover.