The following categories exist on the wiki, and may or may not be unused. Also see wanted categories.
- MineralOilProduct (5 members)
- DieselFuelRole (0 members)
- HydroPowerPlant (5 members)
- EmailAddress (0 members)
- FissileMaterialEntity (1 member)
- Project (1 member)
- Conventional (1 member)
- TypicalPeriod (2 members)
- TemperatureChangingProcess (0 members)
- GaseousFossilFuel (4 members)
- Picogram (0 members)
- FluorinatedGreenhouseGas (4 members)
- Norm (0 members)
- Institution (0 members)
- EnergyMarketModel (0 members)
- Pint (0 members)
- Forecast (0 members)
- VoltPerMeter (0 members)
- System (3 members)
- Ounce (0 members)
- MicrolitersPerMinute (0 members)
- Simulation (0 members)
- Identifier (8 members)
- TwoDimensionalSpatialRegion (2 members)
- EcoinventElementaryExchange (1 member)
- RoentgenEquivalentMan (0 members)
- SewagePlant (0 members)
- FuelCost (0 members)
- ThermalEnergy (6 members)
- SteamReformingHydrogen (2 members)
- TemperatueMeasuringDevice (1 member)
- DistrictHeating (0 members)
- CubicCentimeter (0 members)
- BlastFurnaceGas (0 members)
- MilligramPerMilliliter (0 members)
- Object (9 members)
- OSWb7d670170a375eff81f3d1b315afa512 (1 member)
- GridNode (0 members)
- VolumePercentage (0 members)
- Arbeitsbereich (0 members)
- Group (0 members)
- Medium (0 members)
- SurfaceTensionUnit (2 members)
- OSWb987bf55c6e75a608c9ff74fbfa2aac0 (1 member)
- ArealSolarEnergyDensity (0 members)
- Rechteckig (0 members)
- CountPerNanomolar (0 members)
- Nanovolt (0 members)
- BigMapNotebookEntry (2 members)
- Optical (0 members)