Altegender

Altegender is a xenogender in which one's gender feels as though it is in a parallel dimension, on a different plane, in a mirror universe, or just in an alternate existence. One may have an understanding of their gender, but it feels distant. It can be combined with other genders to form more specific genders, such as altegirl, alteboy, or altenonbinary. The name is derived from the phrase "alternate existence".

History and Flag
The term and flag were created on September 20, 2016, by Tumblr user gaypeachs.