The following categories exist on the wiki, and may or may not be unused. Also see wanted categories.
- Perch (0 members)
- Tesla (0 members)
- AreaDensityUnit (3 members)
- ModelFactsheet (0 members)
- CoefficientOfPerformanceValue (0 members)
- Kilojoule (0 members)
- RenewableEnergy (7 members)
- ElectricFieldStrengthUnit (1 member)
- Radiological (0 members)
- MolarMassUnit (2 members)
- SystemCost (0 members)
- StrictParticipantsProcess (1 member)
- BaseUnit (15 members)
- Process (40 members)
- CombustionFuelTransport (1 member)
- Mebibyte (0 members)
- Dehngeschwindigkeit (0 members)
- SquareKilometer (0 members)
- Deca (0 members)
- SyntheticMethane (1 member)
- ExchangeRate (0 members)
- GenericallyDependentContinuant (6 members)
- Tablespoon (0 members)
- ImportPrice (0 members)
- UnitOfMeasurement (43 members)
- GasolineFuel (2 members)
- BottomUp (0 members)
- Time (6 members)
- ExternalOptimiser (0 members)
- Month (0 members)
- HeatingAndCoolingSector (0 members)
- OrganizationalSubUnit (4 members)
- MilligramPerKilogramPerDay (0 members)
- Picovolt (0 members)
- TypicalDay (0 members)
- Dataset (4 members)
- Katal (0 members)
- TheoreticalStockPotential (0 members)
- SodiumSulphurBattery (0 members)
- Outage (2 members)
- File (7 members)
- ElectricityGrid (0 members)
- Labor (0 members)
- MaterialProperty (9 members)
- Hectare (0 members)
- MetaCharacteristic (2 members)
- ObjectProperty (23 members)
- Pages with script errors (8 members)
- Property (8 members)
- QuantityProperty (2 members)