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[1]