The following categories exist on the wiki, and may or may not be unused. Also see wanted categories.
- BoronAtom (0 members)
- D20ParticleSize (0 members)
- PositiveElectrodeCoatingThickness (0 members)
- LengthC5 (0 members)
- ThreeMeTwoOxazolidinone (0 members)
- ThermochemicalTesting (5 members)
- LiquidJunction (0 members)
- IridiumSaltCompound (0 members)
- TantalumSymbol (0 members)
- NickelIISulfide (0 members)
- SaltBridge (0 members)
- CellCurrent (4 members)
- WaveSpring (0 members)
- NominalVoltage (0 members)
- ElectrodeCoverageDensity (0 members)
- PerCentiMetre (0 members)
- NanoMolePerMicroMole (0 members)
- ElectrochemicalMigration (0 members)
- LithiumDifluorophosphate (0 members)
- NickelIITetrafluoroborate (0 members)
- AluminiumOxideCompound (1 member)
- LengthE (0 members)
- Viscometry (0 members)
- LithiumSulfite (0 members)
- Digital Calipers (0 members)
- ChemicalNomenclature (3 members)
- ElectricPolarization (0 members)
- GramPerSecond (0 members)
- URI (2 members)
- NegativeIntegerData (0 members)
- StrontiumSymbol (0 members)
- Workflow (5 members)
- Perceptual (0 members)
- SquareMetrePerNewton (0 members)
- CPlusPlus (0 members)
- BariumHexafluorophosphate (0 members)
- CharacterisationHardware (7 members)
- Information (1 member)
- ManganeseIIIOxide (0 members)
- LithiumHydroxide (0 members)
- CurrentChangeRate (0 members)
- CobaltIIBromide (0 members)
- FormingFromPlastic (8 members)
- Program (0 members)
- LidSealingCompound (0 members)
- ZincBistrifluoromethanesulfonylimide (0 members)
- Capacity (after formation) (0 members)
- SurfaceA2C (0 members)
- Electrolyte volume (0 members)
- PowderCoating (0 members)