Try And Make Sure To Get It Right- The Difference Between Them Is Massive And Will Affect Whether People Read Or Dont Read - Tumblr Posts
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When you're posting a work on AO3, one of the options you have is to add relationship tags to your work. Sometimes you'll see tags that look almost exactly the same and you might wonder what the difference is.
A/B indicates that person A and person B have a romantic or sexual relationship in this fic.
A&B indicates that person A and person B have a non-romantic and non-sexual relationship in this fic - they are friends, colleagues, family members etc. who have a platonic relationship.
If you want to add more specific information about what kind of relationship the characters have in your story, you can use the additional tags or the summary to let readers know more about what they're in for.
Editing to add: Oh yes! And it doesn't matter which character you list first in your tag. They both filter the same way in the site's database.