What term is used to describe the tail feathers of a hawk?

The term used to describe the tail feathers of a hawk is "train." In ornithology, the train refers specifically to the long tail feathers of birds of prey, including hawks. The train plays a crucial role in flight stability and maneuverability, allowing these birds to perform sharp turns and quick maneuvers as they hunt.

While the other terms may relate to feathers in different contexts, they do not specifically denote the tail feathers of a hawk. "Tail" is a more general term for the entire tail structure but does not encompass the specialized terminology used in falconry and bird science. "Rudder" typically refers to the control surface in aviation, not in avian anatomy. "Quill" pertains to the stiff, hollow shaft of a feather but does not specify any particular feather grouping, particularly the tail feathers. Hence, "train" is the most accurate term to describe the tail feathers of a hawk.