An asterisk on a relationship in a use case diagram represents multiplicity of the association.

Name: An asterisk on a relationship in a use case diagram represents multiplicity of the association.
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An asterisk is used to indicate the multiplicity of the association in a use case diagram. It represents that the association can occur multiple times. For example, a customer can place multiple orders, so there would be an asterisk on the association line between the customer and order use cases.

An Asterisk on a Relationship in a Use Case Diagram