deerdryad replied to your post “Yes, you can tag your dark or triggery work on AO3 with the characters...”
@bm-reference-library the way I've always understood was that "/" was for OTP and "&" was for BroTP. At least that's what I usually see them used for, except for in the Homestuck fandom.
This is essentially correct, yes.
“/” is for sexual and/or romantic relationships (doesn’t have to be both, just one is fine).
“&” is for platonic (neither sexual nor romantic) relationships; most people use it for non-romantic, non-sexual friendship, but it’s also legit to use it for platonic family relationships, platonic mentor-mentee relationships, platonic teammates, familiars, and even sworn enemies if the work is basically focused on their platonic hateship.