The following categories exist on the wiki, and may or may not be unused. Also see wanted categories.
- Department (0 members)
- LeadIISulfate (0 members)
- CollectiveAgent (0 members)
- Contact material (contacting) (0 members)
- Interface (1 member)
- ThomsonCoefficient (0 members)
- AluminiumBasedElectrode (0 members)
- DegreeCelsiusPerSecond (0 members)
- NuclearPrecessionAngularFrequency (0 members)
- IndiumIIISulfide (0 members)
- 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)