Astrian is a combination between Wistirian, Ciphrian, Sunsatian, and Firistian from The Astrian System. It can be fluid through them four genders but it doesn't have to be. They may also feel their gender has a siderealian or locusian aura. It can be paired with another gender or be used on its own.
Matreesian is the demigender version of astrian, meaning it only has a partial connection to astrian, with the other part being something else. The "other part" can be an unrelated gender to The Astrian System but it doesn't have to be.
The astrian flag was coined by FANDOM user RoseWatera on June 4th 2021. Light pink represents feminine aesthetics, orange represents neutral aesthetics, the mint green represents xenic aesthetics. The light blue represents masculine aesthetics. The white diamond in the middle represents being a part of the astrian system.
The term was coined on Novenber 21st 2020 by FANDOM user RoseWatera on the astrian system page. This page is the original source of the term.