It would be the realities we'd need to start with, either way, since the individuals here are the whose realities we'd most probably want to reach...

[Trailing off as he considers the other question, Jetfire dives down sharply and then back up, for the moment flying underneath Skyfire.]

I believe someone... ah, Cliffjumper? mentioned at least one reality where they have a system of classification, I'd assume by using their own as the original point-of-reference.