Apogender is a subset of agender in which one feels not only genderless but entirely removed from the concept of gender.
History
Apogender was coined on July 11, 2014 by queerspike, a since-deactivated Tumblr blog.[1]
Flag
The flag was created by Tumblr user pastelmemer (now pastelroswell) on July 10, 2016.[2] The meaning is unknown but it is possible that the green comes from the agender flag, and the black represents genderlessness.
Etymology
Apo is a Greek word that means away from, separate, or at the farthest point.