@Hiraelle there's such a thing as colorgender, a gender defined as a color, with the accompanying flat color flags
there's numbergender, a gender defined as a number, with the obvious "flag" with an arabic number
there's "circumtrans", which means a girl who feels like a trans girl who is a girl (???), the flag looks like a bi flag wit a pink recycling logo on top, opposite colors for "boys"
the "genders" cishets have come up with are a ~wonder~
@Hiraelle don't believe me? I can link you to the wiki