The following categories exist on the wiki, and may or may not be unused. Also see wanted categories.
- LengthB2 (0 members)
- MagnetomotiveForce (0 members)
- CharacterisedSample (0 members)
- StrontiumHydroxide (0 members)
- ComputerSystem (0 members)
- NanoFarad (0 members)
- YottaPrefixedUnit (1 member)
- AluminiumSulfate (0 members)
- CausalSystem (2 members)
- SpeedFractionUnit (0 members)
- SodiumTetrafluoroborate (0 members)
- SolidAngle (0 members)
- Hypothesis (0 members)
- CubicMetre (0 members)
- ParticleNumberDensity (0 members)
- NegativeElectrodeActiveMaterialMaximumGuestConcentration (0 members)
- Winding/Stacking (0 members)
- MilliNewtonPerMetre (0 members)
- JoulePerSquareMetre (0 members)
- SilverSymbol (0 members)
- CentiMolePerKilogram (0 members)
- ThermalDiffusionRatio (0 members)
- RawData (4 members)
- LithiumHydroxideSolution (0 members)
- MendeleviumAtom (0 members)
- SpecificInternalEnergy (0 members)
- SodiumBisoxalatoborate (0 members)
- ElectricResistance (6 members)
- JoulePerMetre (0 members)
- SIAccepted (0 members)
- SiliconGraphiteElectrode (0 members)
- SodiumManganeseOxideElectrode (0 members)
- ZincAirBattery (2 members)
- ShelfLife (0 members)
- LithiumManganeseOxide (0 members)
- NickelIIIodide (0 members)
- MicroVolt (0 members)
- WattPerSquareMetreQuarticKelvin (0 members)
- ArchetypeManufacturing (0 members)
- CubicCentiMetre (0 members)
- ElectrolyticCell (1 member)
- AmountConcentrationUnit (5 members)
- Mounting (0 members)
- DiffusionArea (0 members)
- RandlesCircuitModel (0 members)
- NeptuniumSymbol (0 members)
- SurfaceA2B2 (0 members)
- Path (0 members)
- MonoblocContainer (0 members)
- OutlierRemoval (0 members)