"DM" is not a trademarked term, because it's a pair of letters. "Dungeon Master" is absolutely a trademarked term, though, and has been since the TSR days.
Thank you for this information, I have added it to my original comment.
Humor, jokes, memes about TTRPGs
"DM" is not a trademarked term, because it's a pair of letters. "Dungeon Master" is absolutely a trademarked term, though, and has been since the TSR days.
Thank you for this information, I have added it to my original comment.