The following categories exist on the wiki, and may or may not be unused. Also see wanted categories.
- Zetta (0 members)
- ScandiumAtom (0 members)
- Action (0 members)
- Barium (0 members)
- Susceptance (0 members)
- Stacking: Positioning (0 members)
- LeadIIBromide (0 members)
- AluminiumSymbol (0 members)
- MaterialTreatment (7 members)
- FromWorkPIecetoWorkPiece (1 member)
- Externally propelled Vehicle (0 members)
- SurfaceCA3 (0 members)
- AlkalineEarthMetalSaltCompound (4 members)
- R54215 (0 members)
- NonTemporalRole (2 members)
- LithiumIronDisulphideBattery (0 members)
- PicoHenry (0 members)
- Laser-Induced Fluorescence (LIF) (0 members)
- BariumTriflate (0 members)
- MagneticTension (0 members)
- PressurePerTimeUnit (9 members)
- MassAttenuationCoefficient (0 members)
- HolmiumAtom (0 members)
- AnodicStrippingVoltammetry (0 members)
- SurfaceB4C (0 members)
- CalciumPerchlorate (0 members)
- Expressing (0 members)
- Intensity (1 member)
- KilogramPerSquareSecond (0 members)
- DifferentialScanningCalorimetry (0 members)
- LowerCriticalMagneticFluxDensity (0 members)
- MercuryIIOxide (0 members)
- Electrochemical (0 members)
- LithiumCobaltOxideElectrode (0 members)
- LithiumIonTitanateBattery (0 members)
- CharacterisationDataValidation (0 members)
- Chemical composition (active material) (0 members)
- RadonAtom (0 members)
- NegativeElectrodeActivationEnergyOfReaction (0 members)
- Optical Speed Sensors (0 members)
- Polyacrylonitrile (0 members)
- YtterbiumSymbol (0 members)
- Metre (0 members)
- FermiTemperature (0 members)
- MicroWatt (0 members)
- KiloHertzMetre (0 members)
- EthylAcetate (0 members)
- R1154 (0 members)
- UnintentionalAgent (0 members)
- NernstEquation (0 members)