Alterian

Alterian is a gender element from the element system. It is a xenine element and is represented by the element of spirit. The xenine element refers to identities that don’t conform or relate to concepts like feminine, masculine, or neutral, but is instead something some else, often concepts, symbols, nature, shapes, feelings. Xenogenders would fall under this category. Spirit is used to represent it because it reflects the nature of the gender element; they are both on a different plane than the other elements and operate on different levels.

One whose gender element is purely xenine would be called alterian. The noun form of the word is alteri (ex: I am alteri). The term can be combined with other gender terms, such as demialterian, or alteriboy.

History
The term alterian and the flag were made on the Tumblr blog Genderelementarchive on December 23, 2017.

Flag
The flag's colors are purple and white, representing the element of spirit. In the center is a circle -- the alchemical symbol for spirit.