What device indicates the landing direction at an airport?

The device that indicates the landing direction at an airport is a tetrahedron. A tetrahedron is a visual runway indicator that is shaped like a four-sided pyramid. It is typically positioned near the runway and is designed to provide a clear visual indication of the direction in which aircraft should approach for landing.

When the tetrahedron is oriented to point into the wind, it shows pilots the runway direction relative to the wind, which is critical for safe landing and takeoff procedures. This device is particularly useful in situations where other forms of navigation may not be as readily available or during low visibility conditions.

In contrast, taxiways facilitate the movement of aircraft on the ground from one part of the airport to another, but do not indicate landing direction. The traffic pattern is established for managing aircraft around the airport during landing and takeoff but does not provide a specific visual indicator. Noise abatement refers to procedures and regulations aimed at minimizing noise exposure around airports, rather than directing aircraft. Thus, the tetrahedron serves a crucial role in aviation by ensuring pilots have the necessary information regarding landing direction.