YAATSNBN is Yet Another Abomination That Shall Not Be Named. A Term used to refer to the 5th edition of the
Dungeons & Dragons game (produced) by
Wizards of the Coast, used primarily by those who prefer the earlier (TSR-produced) versions. It is a tongue in cheek play on the
abbreviation TETSNBN and TATSNBN. Pronounced "Yats Bin".