The following categories exist on the wiki, and may or may not be unused. Also see wanted categories.
- CommonReportingFormat (0 members)
- Extensometer (0 members)
- BrinellHardnessTest (0 members)
- PowerRating (0 members)
- ElectricalHeater (0 members)
- AirPollutant (6 members)
- FinalEnergyCarrier (0 members)
- Hydrogen (6 members)
- Knotenname (0 members)
- PowerToGasProcess (2 members)
- ElectricitySector (0 members)
- WesternTexasIntermediate (0 members)
- StockPotential (5 members)
- PlugInHybridElectricVehicle (1 member)
- PoliticalParty (0 members)
- AnalyticalApproach (3 members)
- Trade (0 members)
- DataciteIdentifier (0 members)
- EnergyCarrier (10 members)
- Fuel (5 members)
- TransportPerformanceUnit (3 members)
- EnergySystem (1 member)
- Metadata (0 members)
- Robot (2 members)
- Competence (0 members)
- EmissionValue (2 members)
- PersonRole (0 members)
- Corporation (0 members)
- EmissionQuantityValue (0 members)
- Potential (2 members)
- OilPowerPlant (0 members)
- ForceUnit (1 member)
- CommaSeparatedFileFormat (0 members)
- DeliveryCost (0 members)
- KiloTonOfOilEquivalent (0 members)
- Abstand (1 member)
- InteractingRegion (0 members)
- DieselVehicle (2 members)
- Database (0 members)
- CrossCheckingAgainstOtherModels (0 members)
- Percent (5 members)
- SquareMillimeter (0 members)
- Sector (6 members)
- Prüfgeschwindigkeit (4 members)
- Nuclear (0 members)
- CombustionFuel (12 members)
- ElectricCharge (1 member)
- Nanomole (0 members)
- QualifizierendeKnotenannotation (1 member)
- WindEnergyConvertingUnit (0 members)