Duocosmic

Duocosmic is a xenogender that is akin to both galaxies and voids, simultaneously something and nothing, existent and naught.

History
This term was coined by Tumblr user sinewslumber on December 6th 2021. The flag was created on the same day

Flag
A flag with colors in this order, top to bottom: dark blue-grey, muted blue-grey, blue-grey, light blue-purple, pale lavender, light blue-purple, blue-grey, muted blue-grey, dark blue-grey.