Shadend

Shadend is an aesthetigender in which one feels as though one’s gender is a shadow or darkness in some way; up for interpretation. (Used like “I’m a shadend” [like ‘I’m a man/woman’] or “I’m shadend” [like ‘I’m nonbinary/agender.’) It was coined on August 10, 2019 by Tumblr user wavership.

Flag
Wavership is also the creator of the flag, which they coined with the term on the same date. The colours likely represent shadows.