Which signal is associated with alerting police of a violent offender?

The correct choice, Signal 66, is specifically used to alert law enforcement agencies about a violent offender. This signal serves as a critical communication tool, providing immediate awareness to officers in the vicinity about an individual who poses a significant threat. Identifying and communicating about such individuals allows police to respond more effectively and ensure the safety of both officers and the public.

In this context, other signals like Signal 300, Signal 410, and Signal 89 may denote different situations or incidents, but they do not carry the specific connotation of alerting police about a violent offender. This distinction is essential for ensuring that law enforcement is prioritized and directed appropriately in situations that could involve immediate danger or criminal activity. Understanding these signals is vital for effective policing and community safety.