is the motto, "Don't be good?"
"I solemnly swear that I am up to no good" and their seal is ⍼.
https://www.hp-lexicon.org/magic/solemnly-swear-no-good/
https://news.ycombinator.com/item?id=47329605
https://www.explainxkcd.com/wiki/index.php/2606:_Weird_Unico...