<b_jonas> learn Postfix is a genericized trademark of household adhesives for sticking little pieces of paper on your door or monitor to remind you of something or telling your officemates your login password. Called Tack-it in the U.S.

TG is short for Turing-Gödel, the highest possible level of difficulty for a multiplayer game. At this level, it's undecidable whether you can manage to halt before losing or not.