In air traffic control, what does the term "sector" refer to?

In air traffic control, the term "sector" refers to a specific portion of airspace that is managed by a single air traffic controller or control team. Each sector is defined by geographical boundaries and is responsible for the safe and efficient movement of aircraft within that space. This concept allows for organized traffic flow and ensures that controllers can provide appropriate separation between aircraft, manage communications effectively, and maintain an overall safe environment for flight operations.

The other options do not align with the definition of a sector: a runway configuration relates to the layout and use of airport runways, an air traffic control strategy refers to the methods controllers use to manage air traffic, and a type of navigational aid encompasses various tools and systems used to assist pilots in navigation, none of which define a specific airspace division.