Stellarian, or stellar non-binary person, is a non-binary gender from the galactian alignment system describing someone who is unaligned, or neutral aligned. The main idea is that stellarians identify as a gender that is unrelated to masculinity and femininity and/or manhood and womanhood, however they still feel gendered and on a similar "plane" as male and female. There are many different stellarian identities, as there are stars in the sky. This is unlike agender or singularian, which are a complete lack of alignment.
Flag
The stellarian flag was posted on Tumblr on December 5, 2016[1]. The shades of green represent the varying levels in which people can experience being stellarian. Yellow represents the non-binary nature of this gender. Black represents those with no gender. Gray represents the varying levels in which people can experience gender. The stars in on the flag represent that there are many different stellarian identities, as there are stars in the sky.
The third alternate stellarian flag was designed by now deactivated tumblr user yourfavgoestoactualpride sometime before December 21, 2016.
Resources
https://www.deviantart.com/pride-flags/art/Stellarian-2-651807853
https://www.deviantart.com/pride-flags/art/Stellarian-3-651807848
https://www.deviantart.com/pride-flags/art/Stellarian-4-652389432