The following categories exist on the wiki, and may or may not be unused. Also see wanted categories.
- AnnotationProperty (9 members)
- CategoryClass (6 members)
- DataProperty (16 members)
- Entity (5 members)
- Http://www.w3.org/ns/prov (12 members)
- ImportedFromTestPageDisplayTitle (0 members)
- Imported vocabulary (8 members)
- Item (32 members)
- OSL/Infrastructure/Template/User (11 members)
- OSLae92be81cdb34d22844d4791ef790d93 (0 members)
- RadianPerSecond (0 members)
- HeatTreatmentProcess (0 members)
- FlowBattery (0 members)
- NonScatteredRadiantFluxDensity (0 members)
- ModelDescriptor (6 members)
- Gigabyte (0 members)
- Sirup (0 members)
- TurnsPerSecond (0 members)
- InstallationCost (0 members)
- Qualitist (0 members)
- QuantityKind (1 member)
- EBike (0 members)
- FreightTransport (1 member)
- Anthracite (0 members)
- GridBoundHeating (2 members)
- TemperatureUnit (3 members)
- Methanation (0 members)
- FormazinNephelometricUnit (0 members)
- DoseEquivalentUnit (5 members)
- Host (0 members)
- MoltenSaltBattery (1 member)
- KiloTonOfCoalEquivalent (0 members)
- ElectricPotentialDifferenceUnit (7 members)
- PartsPerHundred (0 members)
- PowerToFuelProcess (2 members)
- Nanosievert (0 members)
- Centi (0 members)
- CitationReference (0 members)
- SpatiotemporalRegion (0 members)
- Form (4 members)
- DirectSolarRadiation (0 members)
- Extension (7 members)
- Uranium (0 members)