What notation is used for a final state in a state machine?

The notation used for a final state in a state machine is represented as a circle with a filled circle inside. This visual representation clearly indicates that the state machine has reached a termination point or final state of activity. It serves to differentiate final states from regular states, where a final state signifies that the processing is complete and signifies the end of a particular process or behavior.

This specific notation aligns with standard practices in Unified Modeling Language (UML), where the inner filled circle signifies the finality and the outer circle denotes the state that transitions can lead to this endpoint. Understanding this notation is crucial for properly interpreting diagrams that model dynamic behaviors in systems, allowing for clear communication of how states evolve and when processes conclude.