What term refers to the blue lights seen around the edges of a runway?

The term that refers to the blue lights seen around the edges of a runway is runway edge lights. These lights are crucial for providing visual guidance to pilots during takeoff and landing, enhancing safety, especially during low visibility conditions. Runway edge lights mark the lateral boundaries of the runway, ensuring that pilots can clearly identify the runway's edges and maintain proper alignment during approaches and departures.

In contrast, taxiway centerline lights are typically green and are used to guide aircraft along taxiways, while obstruction lights are used to indicate the presence of obstacles in the vicinity of air traffic, and threshold lights mark the beginning of the runway area. Each of these lighting systems serves a different purpose in aviation, contributing to safe aircraft operations but not specifically designed to highlight the runway edges.