In a Use Case diagram which of the following is represented by a Matchstick figure?

In a Use Case diagram, the Matchstick figure typically represents an Actor. An Actor is an entity that interacts with the system being designed and can be a user, another system, or any stakeholder that has a role in the business process. This visual representation helps to identify who is involved in the use cases and their relationships with the system.

Actors are crucial in understanding the requirements and interactions necessary for the system's functionalities. Their representation using a simple figure makes it easy to visualize distinct entities that can initiate interactions within the system, distinguishing them from the functional aspects of the system itself, like Use Cases and Systems boundaries, which are represented differently in diagrams.

By recognizing Actors through this standardized visual cue, stakeholders can more easily grasp the intended audience and their roles in the system's operations. This facilitates clear communication and better design of the system tailored to meeting user needs.