| Represents the sensors used to gather information about the external environment. |
| •owl:Thing |
| •SpatioTemporalThing |
| •Endurant |
| •PhysicalEndurant |
| •PhysicalObject |
| •NonAgentivePhysicalObject |
| •PhysicalArtefact |
| •Equipment |
| •InformationGatheringEquipment |
| •Sensor |