It's similar to athenian.
History and Flag
Nullarian was coined by Tumblr user lgbtqiarchive, September 19th, 2019.
Imoga-pride also commented on their interpretation of the term nullarian:
"It has to do with having a nullitive identity or experiencing null attraction, just like pluralian has to do with m-spec community, nullian/nullic is with aspec communities. I could had used aroace sign (♠ace of spades) but I feel this one includes tertiary non-attractions too.
Nullarians aren’t essentially omniaspec/panaspec, they just don’t experience a form of attraction, not necessarily all types of them."