What is the name of the center-most flashing light on a tower?

The center-most flashing light on a tower is commonly referred to as the middle beacon. This designates its position on the structure, positioned between the top and bottom beacons. Middle beacons serve a critical function in aviation safety by providing visual guidance to aircraft, indicating the presence of a tall structure, especially in low-visibility conditions. These lights are typically high-intensity and often flash in a specific pattern to maximize visibility.

Top beacons are generally used at the highest point of the tower, while bottom beacons are located at the base. Signal lights, on the other hand, can refer to a broader category of lights with varied functions, not specifically indicating the center position. The term middle beacon is the most precise for identifying the specific light being asked about in this context.