A pronoun pin is like a button pin that says he/him, she/her, they/them, etc. It's supposed to help with getting called the correct pronouns. It's especially helpful for trans, genderfluid, and nonbinary people. I have one because one of my cousins got it for me. I honestly forget I have it and I don’t care that much, but some people find them very helpful. It can also unfortunately help transphobes call people the wrong pronoun though…