The following categories exist on the wiki, and may or may not be unused. Also see wanted categories.
- R2477 (0 members)
- StartingCapability (0 members)
- VolumePerTimeUnit (3 members)
- AmmoniumNitrate (0 members)
- SquareMetrePerSquareSecond (0 members)
- RoundElectrode (1 member)
- Areal loading (wet) (0 members)
- GigaPrefixedUnit (9 members)
- VolumeFraction (0 members)
- CopperOxideElectrode (0 members)
- PerPicoMetre (0 members)
- ZirconiumOxideCompound (1 member)
- MegaHertzMetre (0 members)
- HertzPerVolt (0 members)
- PotassiumSymbol (0 members)
- Laser induced breakdown spectroscopy (=LIBS - CMC: Anode) (0 members)
- CyclicChronopotentiometry (0 members)
- CharacterisationProcedureValidation (0 members)
- AmountPerAreaTimeUnit (4 members)
- PotassiumChloride (0 members)
- ChemicallyDefinedMaterial (1 member)
- Photoelectric Sensors (0 members)
- MiniumumConcentration (0 members)
- Charging (8 members)
- Decay (0 members)
- CharacterisationTechnique (16 members)
- MetalloidElementalSubstance (6 members)
- SubjectiveProperty (0 members)
- Electrogravimetry (1 member)
- KiloMetrePerSecond (0 members)
- Contact material pre-treatment (0 members)
- MilliMetrePerSecond (0 members)
- Pycnometer (0 members)
- Potentiostat (0 members)
- Gyroradius (0 members)
- KilogramPerSquareKiloMetre (0 members)
- Micro-Ohmmeter (0 members)
- Folding (0 members)
- SternModel (0 members)
- LithiumCarbonate (0 members)
- VolumePerAmountUnit (3 members)
- HydrogenChloride (0 members)
- HertzPerTesla (0 members)
- OneSidedHeating (0 members)
- LithiumIronPhosphate (0 members)
- AmmoniumSaltCompound (12 members)
- IntData (2 members)
- ZincCarbonBattery (4 members)
- HybridFlowBattery (4 members)
- R2450 (0 members)