The following categories exist on the wiki, and may or may not be unused. Also see wanted categories.
- PolymerCompound (10 members)
- AluminiumAtom (0 members)
- MentalAgency (0 members)
- BisOxalatoBorate (0 members)
- LeadAcidBattery (1 member)
- HertzMetre (0 members)
- DifferentialPulseVoltammetry (2 members)
- ChemicalComposition (0 members)
- ChargingConstantCurrentPercentage (0 members)
- GrahameModel (0 members)
- D25ParticleSize (0 members)
- Watt (0 members)
- SurfaceAreaPerVolume (0 members)
- RotatingRingDiskElectrode (0 members)
- PascalSecondPerCubicMetre (0 members)
- PhaseDifference (0 members)
- NonConvergent (0 members)
- MechanicalEfficiency (0 members)
- ActivationOverpotential (0 members)
- TimeSeriesDataSet (1 member)
- AluminiumTriflate (0 members)
- StandardElectrodePotential (0 members)
- AproticSolventCompound (32 members)
- CoulombPerCubicCentiMetre (0 members)
- Femto (0 members)
- BariumSulfide (0 members)
- TimeMeasurement (0 members)
- MolarElectrochemicalPotential (0 members)
- RutheniumBasedElectrode (0 members)
- VanadiumVOxide (0 members)
- BondedObject (1 member)
- Fractography (0 members)
- IndiumIOxide (0 members)
- HeatCapacity (2 members)
- EMMO (2 members)
- NanoSiemensPerCentiMetre (0 members)
- IsentropicExponent (0 members)
- Sealing (0 members)
- PicoWatt (0 members)
- Batch size (mixing) (0 members)
- Calcium (0 members)
- City (26 members)
- SeleniumAtom (0 members)
- PositiveElectrodeActiveMaterialGuestStoichiometricCoefficientAtSOC0 (0 members)
- GrandCanonicalPartionFunction (0 members)
- MagnesiumAirBattery (0 members)
- StepTime (0 members)
- DifferentialLinearPulseVoltammetry (0 members)
- KilogramSquareMetre (0 members)
- CoefficientOfThermalExpansion (2 members)