Neutrois is a gender identity under the nonbinary umbrella. The term was coined in 1995 by a neutrois person named H. A. Burnham. It is generally defined as a “neutral” or “neuter” gender; neutrois people may seek surgical transition to appear gender-neutral. Some use the word neutrois as a synonym of agender or genderless, whereas others say these words mean completely different things.
In the commonly-used neutrois flag, white is for neutral, unidentified, or questioning gender, dark chartreuse green (the inverse of lavender, the mix of pink and blue) is for nonbinary gender that isn’t female or male, and black is for agender or genderless.