noun A word used to identify a person, place, thing, or idea. In this case, 'police whistle' is a noun referring to a whistle used by police officers.
In sports, referees and coaches may use police whistles to signal the start or end of a game, indicate a foul, or communicate with players.
Police whistles are commonly used by law enforcement officers to signal for attention, call for backup, or alert others to a situation.
Security personnel and lifeguards often use police whistles to alert others to potential dangers or emergencies.
Police whistles are also used in training exercises and drills to simulate emergency situations or practice response protocols.
A writer may use the term 'police whistle' in their crime novels to describe the sound of a whistle blown by a police officer to alert others or call for backup.
A psychologist may use the term 'police whistle' in a therapy session to discuss a traumatic event involving the sound of a police whistle, which could have triggered anxiety or fear in their patient.
A police officer may use a police whistle as a tool to signal for assistance, direct traffic, or command attention in emergency situations.
A security guard may use a police whistle as a means of alerting others to a potential security threat or to enforce rules and regulations within their designated area.