Destruction Markers
A destruction marker (also known as a termination symbol) is a notation that can appear on a lifeline to indicate that an instance (object or classifier role) has been destroyed. Usually, the destruction of an object results in the memory occupied by the data members of the object being freed.
For example, when a customer exits the Web site for an e-commerce application, the ":Cart" object that held information about the customer's activities is destroyed, and the memory that it used is freed. The destruction of the ":Cart" object can be shown in a sequence diagram by adding a destruction marker on the ":Cart" object's lifeline.
Shape
A destruction marker appears as an X at the end of a lifeline.
Naming Conventions
Destruction markers do not have names.
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