The following categories exist on the wiki, and may or may not be unused. Also see wanted categories.
- OSW1941e1f3a829554e891c17c0281ee065 (1 member)
- DataFileFormat (2 members)
- Organization (5 members)
- Desorption (0 members)
- InformationUnit (9 members)
- Kerosene (1 member)
- GasPowerPlant (0 members)
- AdministrativeProcess (1 member)
- Computerknoten (1 member)
- Object (2 members)
- CarbonTaxValue (0 members)
- Kilobasepair (0 members)
- ScenarioYear (0 members)
- TrainStation (2 members)
- PrivateFunder (0 members)
- HvdcLine (0 members)
- ArtificialAmbientThermalEnergy (0 members)
- MainQuantityProperty (9 members)
- PmdCoTerm (0 members)
- Kraftmessdose (0 members)
- EnergyBalanceCollection (0 members)
- Watercraft (1 member)
- DataLicence (0 members)
- Quarter (0 members)
- Distribution (0 members)
- CellsPerMicroliter (0 members)
- SyntheticAmmonia (0 members)
- ContinuantFiatBoundary (3 members)
- AnfangsDicke (0 members)
- SustainabilityCriterion (0 members)
- Coordinates (1 member)
- MarineTidalEnergy (0 members)
- CarbonTax (0 members)
- Scenario (6 members)
- SolarPowerPlant (2 members)
- Energy (9 members)
- SolarEnergyTransformation (4 members)
- Reference (1 member)
- GesamteExtensometerDehnungBeiHöchstkraft (0 members)
- FuelTank (0 members)
- MarineWaveEnergyPowerPlant (0 members)
- WaterBody (2 members)
- InternalCombustionVehicle (4 members)
- SquareCentimeter (0 members)
- DownholeHeatExchanger (0 members)
- CompressedGasCar (0 members)
- CokeOvenGas (0 members)
- ExternalImportOntologyModule (0 members)
- LowerYieldStrength (0 members)
- Micrometer (0 members)