The following categories exist on the wiki, and may or may not be unused. Also see wanted categories.
- Sievert (0 members)
- SustainableProcess (0 members)
- BiogasPowerUnit (0 members)
- FuelCellElectricVehicle (2 members)
- NonGovernmentalOrganization (2 members)
- Enumeration (6 members)
- Volume (0 members)
- AmbientThermalEnergyTransfer (0 members)
- Demontageprozess (0 members)
- Measurement (0 members)
- Motorcycle (0 members)
- GramPerCubicCentimeter (0 members)
- BigMapLabRecipe (1 member)
- VolatileOrganicCompound (2 members)
- GaseousCombustionFuel (9 members)
- MillionTonOfCoalEquivalent (0 members)
- Filter (0 members)
- TransmissionElectronMicroscope (0 members)
- OepStudyFactsheet (0 members)
- Process (7 members)
- FundingCall (0 members)
- DataPreprocessing (0 members)
- UnitOfMeasure (1 member)
- Ship (2 members)
- Megajoule (0 members)
- EnergyStorageFunction (5 members)
- ProgramParameter (0 members)
- MoleFraction (0 members)
- EnergyBalanceSectorDivision (0 members)
- Tunnel (0 members)
- ElectricityImport (0 members)
- Fluid (10 members)
- Contract (0 members)
- QuantityValue (22 members)
- FurnaceCharacteristic (4 members)
- TubeCollector (0 members)
- ChemicalEnergyStorageFunction (0 members)
- Grips (0 members)
- SulphurDioxide (0 members)
- Acre (0 members)
- EmissionPrice (2 members)
- MomentumUnit (1 member)
- NegativeEmission (0 members)
- ParticleRadius (0 members)
- MySpecialEventType (1 member)
- GasFiredPowerUnit (0 members)
- DieselCar (0 members)
- MegawattHour (0 members)
- RedoxReaction (2 members)
- Foundation (0 members)