The following categories exist on the wiki, and may or may not be unused. Also see wanted categories.
- DelimiterSeparatedFileFormat (1 member)
- OSWe6e8bbb418ad51988fc9c2085ae5b514 (1 member)
- NonAssociatedGas (0 members)
- WasteFuel (4 members)
- CooperativeProgramming (0 members)
- AngleUnit (2 members)
- Schlitten (0 members)
- EnergyTransfer (4 members)
- NaturalGas (5 members)
- FossilHydrogen (2 members)
- OSWe87966b5189256328ea3af8cfeee92a9 (1 member)
- DiameterAfterFracture (0 members)
- Bügelmessschraube (0 members)
- EndDicke (0 members)
- Air (2 members)
- AirPollution (0 members)
- Picometer (0 members)
- DataCenter (0 members)
- CombustionThermalEnergyTransformation (0 members)
- ErrorReportDocument (0 members)
- Millisecond (0 members)
- SolarRadiationReceivingSurface (3 members)
- Atto (0 members)
- GrossElectricityGeneration (0 members)
- MarketRevenue (0 members)
- DieselTruck (0 members)
- PriceRequest (0 members)
- TextFileFormat (2 members)
- CapacityPremium (0 members)
- LiquidRenewableFuel (0 members)
- TypDerMesslängenmarkierungen (0 members)
- PrimaryEnergyCarrier (5 members)
- Ocean (0 members)
- PlugInHybridElectricCar (0 members)
- AnalysisScope (0 members)
- CargoShip (2 members)
- SecondaryControl (0 members)
- Liter (0 members)
- Picosecond (0 members)
- WasteThermalEnergy (1 member)
- IonicBond (0 members)
- Wind (0 members)
- VanDerWaalsBindung (0 members)
- MechanicalTestingProcess (3 members)
- SolarChemicalEnergyTransformation (0 members)
- PrivateTransport (0 members)
- TheoreticalFlowPotential (0 members)
- RadioactivityConcentration (2 members)
- Dehngrenze (2 members)
- ArealEnergyDensity (1 member)