Apothibinary is a term for abinary people who are repulsed by the concept of having a binary gender, having a gender related to the gender binary, or having the concept of the gender binary applied to them.
History
The term appears to have been coined on January 26th, 2019 by Tumblr user imoga-pride.
Flag
The flag was coined on January 26th, 2019 by Tumblr user imoga-pride.
Resources
https://beyond-mogai-pride-flags.tumblr.com/post/182331353095/apothibinary-flag