Neptunic refers to an individual who is attracted to both nonbinary and female gender.
It can also be described as the attraction to all people except men and man-aligned and/or masculine-aligned nonbinary people.
This orientation is often used by non-binary people to describe their attraction without relying on the gender binary, but it can be used by anyone. It can also be used as a sexuality, romantic orientation, or descriptor of both.
The attraction to masculine and nonbinary individuals is uranic; the attraction to androgynous-aligned non-binary individuals is saturnic.