Using the Graphic Editors : Working with Charts and Diagrams : Use Case Diagrams : Use Case Diagram Icons : General Use-Case Icons

General Use-Case Icons
 
Create Boundary Box - creates a boundary box. A boundary box depicts the limits of the system and is shown as a rectangle spanning all the use cases in the system.
Create Actor - creates an actor. An actor is any entity (person or system) that performs certain roles in the system defined by a boundary box. An actor is depicted as a stick figure and only interacts with a use case.
Create Use Case - creates a use case. A use case is a distinct piece of functionality within a system and is shown as an oval.