Nulltrois

Nulltrois, nullitrois, nulitrois or nultrois is a leptrois descriptor. It lacks a single definition but can include:
 * Gendernull and gender nullity
 * Zerotrois (zerogenders)
 * "Ambitrois of Negative × Positive"
 * Genderfree
 * Mnioct
 * Gendervoid
 * Genderempty