The following categories exist on the wiki, and may or may not be unused. Also see wanted categories.
- AngularWavenumber (0 members)
- JosephsonConstant (0 members)
- MaxContinuousDischargeCurrent (0 members)
- PureNumberQuantity (0 members)
- SpecificMonetaryValue (0 members)
- ElectrochemicallyActiveSurfaceArea (0 members)
- LeclancheElectrolyte (0 members)
- IntentionalProcess (0 members)
- MassRatioOfWaterToDryMatter (0 members)
- GasDiffusionElectrode (0 members)
- Redundant (0 members)
- BatteryCyclerSystem (0 members)
- RoadVehicle (0 members)
- MercuryAtom (0 members)
- CurrentSink (0 members)
- AreicCapacity (0 members)
- ThalliumAtom (0 members)
- CSVPlusJSON (0 members)
- AngularVelocity (0 members)
- FuelCell (0 members)
- CatalyticActivity (0 members)
- ChemicalSymbolicConstruct (0 members)
- CopperSymbol (0 members)
- CyclotronAngularFrequency (0 members)
- RelativeVolumeStrain (0 members)
- Meson (0 members)
- StandardChemicalPotential (0 members)
- BatteryPack (0 members)
- ServiceLife (0 members)
- MechanicalQuantity (0 members)
- DiscreteData (0 members)
- NCM111Electrode (0 members)
- TemperatureMeasurement (0 members)
- AnalyticalMeasurementDevice (0 members)
- Letter (0 members)
- SeriesParallelConnection (0 members)
- StandardAbsoluteActivityOfSolvent (0 members)
- CondensedFormula (0 members)
- InformationTransportProcess (0 members)
- StrippingChronopotentiometry (0 members)
- SodiumSymbol (0 members)
- ZirconiumAtom (0 members)
- Silver (0 members)
- MigrationLength (0 members)
- LithiumIntercalationElectrode (0 members)
- Manufacturer (0 members)
- MassStoppingPowerDimension (0 members)
- Organisation (0 members)
- RelativeMassConcentrationOfWaterVapour (0 members)
- IodineSymbol (0 members)