All links on this post are saved to the wayback machine, as will this post be the moment I post it.
Othran flag (original post here) Internet archive link for the flag is here.
[ID: A pride flag with five horizontal stripes of: Dark grey, light grey, white, pale yellow, and black. End ID.]
Othran is a nonbinary alternative term equivalent to man or woman.
Xenothran is a more specific version that people who are also xenogender can use if they want.
Xenothran flag (Internet archive link)
[ID: A pride flag with six stripes of: Pastel red, pastel orange, pale yellow, grey, white, pale yellow, and black. End ID.]
Also, while we're at it, here's an othri flag, a juvenile (affectionate) version of othran, used like boy or girl.
Othri flag: (Internet archive link)
[ID: A pride flag with five symetrical strpes of: black, dark grey, pale yellow, dark grey, and black. End ID.]
and can't forget xenothri! (internet archive link)
[ID: A flag with five stripes of pastel red, orange, yellow, dark grey, and black. End ID.]
All of these flags are public domain, use them for anything you want! Please just try to include image descriptions when posting online -- you are encouraged to copy and paste the ones above!
You are also welcome to make further combination flags like xenothrigirl or xenothrenby or xenothriboy or anything else like that :)
Please upload the flags you create to the internet archive for posterity! Accounts are free and easy to make!