What does the term "squawk" refer to in aviation?

In aviation, the term "squawk" specifically refers to the command given to a pilot to set their aircraft's transponder to a specific code provided by Air Traffic Control (ATC). The transponder is an electronic device on the aircraft that communicates with radar systems, helping ATC to identify and track the aircraft. By using the term "squawk" followed by a code, ATC can efficiently manage air traffic by assigning unique identifiers, which improves the radar picture and enhances situational awareness.

Using the transponder to squawk a designated code not only helps in identifying the aircraft on radar but also allows pilots to take advantage of additional services such as traffic alerts and weather updates based on transponder data.