The following categories exist on the wiki, and may or may not be unused. Also see wanted categories.
- SpecificHeatCapacity (0 members)
- PotentiometricStrippingAnalysis (0 members)
- Illuminance (0 members)
- ConductivityCell (0 members)
- GalliumSymbol (0 members)
- KinematicViscosity (0 members)
- Centi (0 members)
- AlkalineZincManganeseDioxideBattery (0 members)
- AlkalineZincAirBattery (0 members)
- Geometrical (0 members)
- Boson (0 members)
- R2170 (0 members)
- Gradient (0 members)
- LaserWelding (0 members)
- ElectrochemicalConstituent (0 members)
- Anode (0 members)
- MassEnergyTransferCoefficient (0 members)
- MoscoviumAtom (0 members)
- DubniumAtom (0 members)
- VoltagePhasor (0 members)
- DisplacementCurrent (0 members)
- TXT (0 members)
- Becquerel (0 members)
- StaticFrictionCoefficient (0 members)
- Magnesium (0 members)
- SeebeckCoefficient (0 members)
- DroppingMercuryElectrode (0 members)
- TheoreticalCapacity (0 members)
- FEC (0 members)
- DEC (0 members)
- Property (0 members)
- MolePerLitre (0 members)
- CoinCell (0 members)
- SemioticEntity (0 members)
- AqueousElectrolyte (0 members)
- ZincSilverOxideBattery (0 members)
- BerylliumAtom (0 members)
- TotalIonization (0 members)
- Degree (0 members)
- BatteryManagementSystem (0 members)
- IridiumSymbol (0 members)
- ElectrochemicalCapacitor (0 members)
- ChlorineAtom (0 members)
- ParticleRadius (0 members)
- SuperconductionTransitionTemperature (0 members)
- Arrangement (0 members)
- PhysicalConstant (0 members)
- StateOfMatter (0 members)
- ThreeElectrodeCell (0 members)
- ObjectHumidity (0 members)