Apapronoun, also called casspronoun, is a state of being indifferent towards what pronouns people use for oneself. It is a form of pronoun non-conformity. Many apapronoun people do not have preferred pronouns and will let other people use whatever pronouns they like.
History
It is unknown when the term was coined, however it has been used since early 2019.
Flag
The Apapronoun flag was coined by Angel on November 12th, 2020. The red represents pronouns, the line through the word-bubble represents indifference, the dark brown represents in-home pronoun use, the lighter brown represents outside pronoun use, and the yellow-ish brown represents internet/messaging pronoun use. The word bubble represents using pronouns in conversation.
Resources
https://beyond-mogai-pride-flags.tumblr.com/post/182333795010/it-could-be-apapronomialapapronominal