Caelumfluid

 is a biogender that feels like it flows through the sky like a cloud or plane.

Definitions

 * Caelumfluid: a fluid gender that feels like it flows through the sky like cloud or a plane - Mason, 2020

History
Caelumfluid was coined on February 11, 2020 by Tumblr user Mason. The flag was created at the same time.