Singularian is a non-binary gender. It is part of the galactian alignment system but is completely separate from from all the other genders, because singularians reject all forms of alignment. Singularian is different from stellarian, as stellarian is a gender seperate from masculinity and femininity, but it still exists on the same plane as them. Singularian can be described as being on a plane entirely separate from the gender binary and any other gender alignment system. As such, singularian cannot be combined with any other gender.
Singularian is similar to agender, it's been said that agender would fall under the category of singularian.