Activity Diagram - Send Signal Notation

UML Tutorials - Herong's Tutorial Examples

∟Activity Diagram - Send Signal Notation

This section describes the Send Signal Notation used in a UML Activity Diagram. A Send Signal Notation represents an action that sends a signal to outside and continues without waiting for any responses.

A Send Signal Notation is a graphical notation used in a UML Activity Diagram to represent a send signal action that sends a signal to outside of the activity. The send signal action does not wait for any responses from the receiver of the signal. It ends itself and passes the execution control to the next action.

A Send Signal Notation is drawn as a convex pentagon with its name placed inside. For example, the "Notify Customer" send signal action in an order processing activity can be drawn as a Send Signal Notation in a UML activity diagram as shown below: