Xenull is a multigender where someone who is part (a) xenogender(s) and part gendernull or both at the same time.
The non-binary equivalent is nullenby. The fluid equivalent is xenullfluid.
History
The term was coined by tumblr user nonbiarrow on May 9th 2021, as well as its flag.[1]
Flag
The flag shows three stripes: gray for gendernull, indigo for xenogender and light blue for being inbetween or both/all genders.