- uniconazole
- uniconductor
- unicontrol
- uniconvergence space
- unicorn plant family
- unicouple
- UNICRI
- unicursal
- unicursal circuit
- unicursal cubic
- unicursal curve
- unicursal graph
- unicursal involution
- unicursal line
- unicursal problem
- unicursal quartic
- unicursal surface
- unicursal theorem
- unicyclic
- unicyclic graph
- unidecagon
- unidecimal number
- unidecimal number system
- unidental ligand
- unidentifiability