Monochromegender or Monochrogender is a xenogender on which one's gender feels a connection and validated to monochrome aesthetics. It could also mean someone who is two opposite genders but at the same time there is another gender present there.
History
Monochromegender was coined on May 29th of 2021 by Twitter user xzyriell. [1]
Flag
The flag was created by the same person who coined the xenogender and it is said to not have any meaning, but the white heart in the middle does represent being proud of being monochromegender.