What is the term for the junction where an airfoil's upper and lower surfaces meet at the rear?

The term for the junction where an airfoil's upper and lower surfaces meet at the rear is the trailing edge. This is a critical part of the airfoil's design because it plays a significant role in the airfoil's aerodynamic characteristics. The trailing edge is where the airflow over the upper and lower surfaces comes together. Its shape and design influence lift and drag, which are crucial for the performance and stability of an aircraft.

The leading edge, in contrast, is the front part of the airfoil, while camber refers to the curvature of the airfoil when viewed in cross-section. Control surfaces are movable parts attached to the wings or tail of an aircraft that help control its flight path but are distinct from the edges of the airfoil itself.