The following categories exist on the wiki, and may or may not be unused. Also see wanted categories.
- AreaDensity (0 members)
- NeodymiumSymbol (0 members)
- PositiveElectrode (0 members)
- ThermodynamicTemperature (0 members)
- MassConcentrationOfWater (0 members)
- ReactorTimeConstant (0 members)
- LanthanumAtom (0 members)
- MeasurementUnit (0 members)
- CarbonPasteElectrode (0 members)
- ElectrochemicalCellEolTesting (0 members)
- SquareMetre (0 members)
- StatisticalWeightOfSubsystem (0 members)
- Extraction (0 members)
- ServiceMass (0 members)
- CadmiumSymbol (0 members)
- CobaltOre (0 members)
- CapacitanceDimension (0 members)
- BatteryContinuumModel (0 members)
- SolarFlowBattery (0 members)
- DegreeCelsius (0 members)
- Sign (0 members)
- FormalElectrodePotential (0 members)
- UraniumAtom (0 members)
- Magnetization (0 members)
- ThermogravimetricMeasurementDevice (0 members)
- ElectricFieldTreatment (0 members)
- PhysicsBasedModel (0 members)
- Circle (0 members)
- AsymmetricMembrane (0 members)
- DischargeEnergy (0 members)
- MeitneriumSymbol (0 members)
- TimeMeasurementResult (0 members)
- MilligramPerSquareCentimetre (0 members)
- Rheometer (0 members)
- HallCoefficient (0 members)
- SpecificHeatCapacityAtSaturatedVaporPressure (0 members)
- AreicSpeedDimension (0 members)
- LCOElectrode (0 members)
- LengthDimension (0 members)
- VolumeFlowRate (0 members)
- Conductometry (0 members)
- CarrierLifetime (0 members)
- RadiantEnergy (0 members)
- BromineAtom (0 members)
- DifferentialPulseVoltammetry (0 members)
- Neper (0 members)
- BerylliumSymbol (0 members)
- CaliforniumAtom (0 members)
- LarmonAngularFrequency (0 members)
- MagneticFieldStrength (0 members)