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.[1] 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.