Pangenderflux

Panflux (or pangenderflux) is a gender identity in which one feels all genders available in one's own culture while the intensity of each one fluctuates, or when one fluctuates between feeling agender and pangender. It can also refer to a person who is both pangender and agender at the same time.

History
The term was first coined by nepkrisprite on tumblr.

Flags
The flag was most likely created by pride-color-schemes on tumblr.