The following categories exist on the wiki, and may or may not be unused. Also see wanted categories.
- Grant (1 member)
- GasEngine (1 member)
- SingleNodeModel (0 members)
- PmdcoEln (2 members)
- AnfangsProbendurchmesser (0 members)
- TestOntologyClassB1 (1 member)
- GasMixture (8 members)
- Gewicht (0 members)
- EnergyConsumptionValue (4 members)
- EnergyConversionEfficiency (0 members)
- ExposureUnit (1 member)
- Consumption (2 members)
- OSW27957ce00caf563d85c86026871e925f (1 member)
- UnitedStatesFdaCup (0 members)
- Inch (0 members)
- VolumePerUnitVolume (3 members)
- EquipmentCost (0 members)
- ElectricityGenerationProcess (8 members)
- HydrogenPowerPlant (0 members)
- CurationSubsetOntologyModule (0 members)
- Ontology (1 member)
- Thermocouple (0 members)
- GeothermalEnergy (0 members)
- Place (1 member)
- ElectricityPrice (0 members)
- KilogramPerSquareMeter (0 members)
- Software (6 members)
- TimeSpan (5 members)
- Milliliter (0 members)
- GeoSample (0 members)
- ClampingPressure (0 members)
- KilometerPerHour (0 members)
- MarketExchangeRole (0 members)
- Good (2 members)
- CrossheadSeparationRate (0 members)
- ElectricalEnergyShare (0 members)
- AnfangsBreite (0 members)
- Data (3 members)
- LoadCellCapacity (0 members)
- Watt (0 members)
- FueledPowerPlant (7 members)
- RadiativeEnergy (1 member)
- OSW2b1ed478656f5b648d4ea42c778fc505 (1 member)
- UnplannedAvailability (0 members)
- DataProcessing (3 members)
- RenewableEnergyCarrier (1 member)
- Algorithm (0 members)
- StatusEnumeration (2 members)
- Motor (3 members)
- BiogasPowerPlant (0 members)