What is the visual representation of an airport beacon?

The visual representation of an airport beacon is a circle with a star inside it. This design is widely recognized and used in aviation regulations and practices to represent navigational aids, particularly airport beacons. The circular shape is indicative of the beacon's function in providing a signal to pilots, while the star symbolizes guidance and direction.

This iconography is effective because it allows pilots and air traffic controllers to quickly identify the beacon from various altitudes and distances. Additionally, the circle is often associated with safety and navigation in various industries, making this representation intuitive within the context of aviation.

Other options do not align with standard representations utilized in aviation. For instance, shapes like squares, triangles, or rectangles do not typically communicate the concept of a beacon in aviation and could represent different symbols or objects that are unrelated to aviation beacon systems.