The following categories exist on the wiki, and may or may not be unused. Also see wanted categories.
- ContinuumSubstance (5 members)
- BondedParticle (1 member)
- StateOfCharge (1 member)
- LowPressureCasting (0 members)
- NumericData (2 members)
- AirElectrode (0 members)
- SurfaceB3C2 (0 members)
- MolarVolume (0 members)
- PerMole (0 members)
- SimulationApplication (3 members)
- GigaPascal (0 members)
- LengthB4 (0 members)
- TotalAngularMomentumQuantumNumber (0 members)
- Semiotics (2 members)
- MilliGramPerGram (0 members)
- LinearIonization (0 members)
- ActivationEnergyOfElectrolyteConductivity (0 members)
- NegativeElectrodeActiveMaterialGuestStoichiometricCoefficientAtSOC100 (0 members)
- Thermogravimetry (0 members)
- LeclancheWetCell (0 members)
- PostTransitionMetalSaltCompound (1 member)
- MagnesiumSulfite (0 members)
- ResemblanceIcon (0 members)
- Web service (1 member)
- Constant (2 members)
- SeriesConnection (0 members)
- StrontiumSulfide (0 members)
- Temperature (Electrolyte) (0 members)
- FullFlowBattery (4 members)
- Contact alignment (0 members)
- TechnetiumSymbol (0 members)
- Issue Label (0 members)
- BariumPhosphate (0 members)
- MegaJoulePerSecond (0 members)
- Tellurium (0 members)
- XpsVariableKinetic (0 members)
- Communicating (0 members)
- MagneticPotentialUnit (5 members)
- ProceduralAgent (0 members)
- LeadIIFluoride (0 members)
- CentiCoulomb (0 members)
- SecondaryIonMassSpectrometry (0 members)
- Theory (3 members)
- RheniumSymbol (0 members)
- SealedCell (0 members)
- Radioactivity (0 members)
- PerKiloMetre (0 members)
- PhysicalBasedSimulationSoftware (0 members)
- ProtonMass (0 members)
- YtterbiumAtom (0 members)