The following categories exist on the wiki, and may or may not be unused. Also see wanted categories.
- TensorBoson (0 members)
- ArcSecond (0 members)
- LiPF6 (0 members)
- FermiAnglularWaveNumber (0 members)
- GalvanicCellDischargingCathode (0 members)
- EmpiricalFormula (0 members)
- FabricatedElectrodeStackSealing (0 members)
- EinsteiniumSymbol (0 members)
- CurieTemperature (0 members)
- GermaniumSymbol (0 members)
- JosephsonConstantDimension (0 members)
- LatentHeatOfPhaseTransition (0 members)
- PhosphorusSymbol (0 members)
- UpperCriticalMagneticFluxDensity (0 members)
- Antiparticle (0 members)
- RotatingDiskElectrode (0 members)
- BatteryMeasurement (0 members)
- Colloid (0 members)
- Bel (0 members)
- Theorisation (0 members)
- DonorDensity (0 members)
- MassFlow (0 members)
- SlowingDownArea (0 members)
- ElectricDisplacementFieldDimension (0 members)
- ObjectParameter (0 members)
- UpperCutoffVoltage (0 members)
- ParticleFluenceRate (0 members)
- AirFlowSorting (0 members)
- PhysicsEquationSolution (0 members)
- Coulometry (0 members)
- PlutoniumAtom (0 members)
- SoftwareTool (0 members)
- MagneticQuantumNumber (0 members)
- Uncoded (0 members)
- AmountPerAreaDimension (0 members)
- SilverChlorideElectrode (0 members)
- ElectronicModel (0 members)
- Distance (0 members)
- SampledDCPolarography (0 members)
- GalvanicCellDischarging (0 members)
- ElectrochemicalCell (0 members)
- AreaFractionUnit (0 members)
- RichardsonConstant (0 members)
- SemioticObject (0 members)
- TimePerVolumeDimension (0 members)
- QuantumData (0 members)
- Chlorine (0 members)
- SemanticStatement (0 members)
- GoldElectrode (0 members)
- SecondAxialMomentOfArea (0 members)