The following categories exist on the wiki, and may or may not be unused. Also see wanted categories.
- MagnesiumSulfide (0 members)
- LeadIINitrite (0 members)
- KiloJoulePerKilogramKelvin (0 members)
- AmountPerMassUnit (10 members)
- AreaTimeUnit (3 members)
- PerVolumeUnit (4 members)
- MicroMolePerKilogram (0 members)
- AstronomicalUnit (0 members)
- Cell components (0 members)
- Osmometry (3 members)
- TransportationDevice (0 members)
- R26650 (0 members)
- MilliGram (0 members)
- FlowCell (1 member)
- MaximumStoichiometricCoefficient (0 members)
- Region (0 members)
- MagneticFluxDensity (4 members)
- Alcohol (6 members)
- SamariumSymbol (0 members)
- Electrochemiluminescence (0 members)
- IndiumAtom (0 members)
- NewtonMetrePerRadian (0 members)
- LithiumIonBattery (12 members)
- Painting (0 members)
- SolidAerosol (1 member)
- Area (3 members)
- OxygenSymbol (0 members)
- ElectricPotentialPerTemperatureUnit (1 member)
- MassPerCubicTimeQuarticTemperatureUnit (1 member)
- EnergyDensityOfStatesUnit (0 members)
- Task Status (3 members)
- LogarithmicUnit (3 members)
- AreaPerAmountUnit (2 members)
- Requirement (0 members)
- SodiumNickelPhosphate (0 members)
- Luminance (0 members)
- ManganeseIIPerchlorate (0 members)
- ElectricChargePerLengthUnit (1 member)
- Contacting sequence (0 members)
- D80ParticleSize (0 members)
- CR2016 (0 members)
- Electrolytes (0 members)
- SurfaceOP (0 members)
- SquareCentiMetre (0 members)
- Metrological (3 members)
- Degenerency (0 members)
- ConstantVoltageDischarging (0 members)
- OsmoticCoefficientOfSolvent (0 members)
- DecaCoulomb (0 members)
- SIDimensionalUnit (197 members)