The following categories exist on the wiki, and may or may not be unused. Also see wanted categories.
- MetrePerSecond (0 members)
- OppositeTerminalPrismatic (1 member)
- DataAcquisitionRate (0 members)
- DecaMetre (0 members)
- NonPositiveIntegerData (1 member)
- MegaJoule (0 members)
- PercentQuantity (2 members)
- PerNanoMetre (0 members)
- SpecificSurfaceArea (0 members)
- TelluriumSymbol (0 members)
- MicroSecond (0 members)
- R1126 (0 members)
- NickelOxideBattery (3 members)
- MetalCarbonDioxideBattery (0 members)
- SeleniumSymbol (0 members)
- NewtonSecondPerMetre (0 members)
- MagnesiumNitrate (0 members)
- OxalicAcid (0 members)
- DoseEquivalentQualityFactor (0 members)
- SodiumTitaniumPhosphateElectrode (0 members)
- ThermalResistanceUnit (1 member)
- Non-governmental Organization (2 members)
- OganessonAtom (0 members)
- LR14 (0 members)
- ModelledProperty (0 members)
- Enumeration (5 members)
- LengthTemperatureUnit (3 members)
- DrawForms (0 members)
- KiloJoulePerKelvin (0 members)
- JoulePerCubicMetreKelvin (0 members)
- Rhodium (0 members)
- BatteryCellHolder (0 members)
- Fourier-transform infrared spectroscopy (FTIR) (0 members)
- SquareLengthPerVoltageTimeUnit (1 member)
- ZincBasedElectrode (1 member)
- RadonSymbol (0 members)
- Laser Diffraction (0 members)
- StandaloneModelSimulation (0 members)
- BenzoicAcid (0 members)
- StrontiumBistrifluoromethanesulfonylimide (0 members)
- Casting pattern (0 members)
- ChargeCarrier (0 members)
- LR44 (0 members)
- P1212081 (0 members)
- GlassFibreSeparator (0 members)
- Humidity (insertion) (0 members)
- ConfocalMicroscopy (0 members)
- PassivationLayer (1 member)
- PotassiumPerchlorate (0 members)
- Stress (0 members)