The following categories exist on the wiki, and may or may not be unused. Also see wanted categories.
- IronIIIHydroxide (0 members)
- CubicMilliMetrePerCubicMetre (0 members)
- FormingFromIonised (1 member)
- ScalarMeson (0 members)
- Osmium staining (SBR: Anode) (0 members)
- R721 (0 members)
- SquareWaveCurrent (0 members)
- Perchlorate (0 members)
- CellBaffle (0 members)
- Band velocity (0 members)
- ZincTetrafluoroborate (0 members)
- LengthB5 (0 members)
- Radiometer (0 members)
- Radius (6 members)
- MetreKelvin (0 members)
- Structural (2 members)
- Layer thickness homogeneity (dry film) (0 members)
- ParticulateMatter (3 members)
- SurfaceCA (0 members)
- WattPerSquareMetrePerNanoMetre (0 members)
- Separator (4 members)
- Joule (0 members)
- SquareMetrePerKilogram (0 members)
- AreaUnit (9 members)
- SulfuricAcidSolution (0 members)
- Bismuth (0 members)
- LithiumTrifluoromethanesulfonyloxalatoborate (0 members)
- MassLengthPerCubicTimeUnit (2 members)
- Molecule (2 members)
- FluorineDopedTinOxideElectrode (0 members)
- ThermalResistivityUnit (1 member)
- ReplacementBattery (0 members)
- DataNormalisation (0 members)
- InterpreterByReferent (3 members)
- SolidLiquidSuspension (0 members)
- ControlProperty (2 members)
- Tera (0 members)
- StandardAbsoluteActivityOfMixture (0 members)
- MegaVoltPerMetre (0 members)
- Current measurement (0 members)
- NickelIITriflate (0 members)
- MilliMolePerKilogram (0 members)
- ActivityCoefficient (0 members)
- NickelOxideHydroxideElectrode (0 members)
- Applied current (0 members)
- PulseCurrent (1 member)
- FemtoMole (0 members)
- SourceCode (0 members)
- Dendrite (0 members)
- BetaDisintegrationEnergy (0 members)