The following categories exist on the wiki, and may or may not be unused. Also see wanted categories.
- Porosimetry (2 members)
- Ethanol (0 members)
- DeviceVolume (0 members)
- BerylliumSymbol (0 members)
- R1131 (0 members)
- CaliforniumAtom (0 members)
- Maximal (1 member)
- LarmonAngularFrequency (0 members)
- ComputerScience (4 members)
- RutheniumIVOxide (0 members)
- TransitionMetalOxideCompound (19 members)
- MagneticFieldStrength (0 members)
- Manganese (0 members)
- DifferentialPotentialPulse (0 members)
- LevelOfAutomation (0 members)
- Winding: Roller diameter (0 members)
- Eddy Current Testing (0 members)
- SpecificHeatCapacity (2 members)
- Convergent (0 members)
- Illuminance (0 members)
- ConductivityCell (0 members)
- GalliumSymbol (0 members)
- SurfaceCA4 (0 members)
- CharacterisationEnvironmentProperty (0 members)
- PairedTerminalPrismatic (2 members)
- KinematicViscosity (0 members)
- PerHenry (0 members)
- CentiPrefixedUnit (11 members)
- Ultrasonic Thickness Measurement (0 members)
- R527 (0 members)
- AlkalineZincManganeseDioxideBattery (14 members)
- AlkalineZincAirBattery (0 members)
- DimethylSulfoxide (0 members)
- Geometrical (4 members)
- Boson (1 member)
- Optical Alignment Systems (0 members)
- PascalSecondPerMetre (0 members)
- Scandium (0 members)
- Gradient (0 members)
- StrontiumBisoxalatoborate (0 members)
- LithiumVanadiumOxideElectrode (0 members)
- ElectrochemicalComponent (16 members)
- PlasticModeling (0 members)
- Optical Microscopy (0 members)
- CR2032 (0 members)
- Anode (0 members)
- MeasurementParameter (0 members)
- MassEnergyTransferCoefficient (0 members)
- MoscoviumAtom (0 members)
- DubniumAtom (0 members)