Note: The Plenipotent Dominion is what used to be called The Fleetmind. It's that AI-powered, city-building superpower parked atop the Milky Way's galactic core, where the supermassive black hole has been turned into a fantastically powerful generator capable of, among other things, moving the entire galaxy. The principal voice of the Plenipotent Dominion, or P.D., is Petey, the warship A.I. liberated by Tagon's Toughs.
Some people have taken to referring to Petey's dominion as "The P.D.," but that is too easily conflated with references to "Police Department," and given the fact that Petey already meddles in the affairs of sovereign states to a level that would give any rights-respecting police department a screaming case of the improbable causes, it's better to spell things all the way out.