Entity

Entity is a general term for a DomainParticipant, Publisher, Subscriber, DataWriter, DataReader or Topic.

Entity is an interface defined in the OMG DDS specification, with the following characteristics:

Configured using a QosPolicyAccepting a ListenerAccepting a StatusConditionThis is the base interface for DomainParticipant, Publisher, Subscriber, DataWriter, DataReader, and Topic classes. Any group of objects of these subclasses may be referred to as Entities.

Source: https://community.rti.com/glossary/entity