An ActorRef is an instance of an ActorClass
([Online documentation](https://eclipse.dev/etrice/docs/concepts/actors#actor-classes-actor-references-ports-and-bindings))

```room
/** Documentation */
ActorRef actorName: ActorClass1
/** A replicated actor of size 4 */
ActorRef actorName[4]: ActorClass1
/** A dynamic actor */
optional ActorRef actorName[*]: ActorClass1
```