What is the meaning of "10-9" in communication?

The meaning of "10-9" in communication is to request that the other party repeat their last transmission. This ensures clarity in communication, especially in law enforcement where clear and accurate relaying of information is crucial. If the first transmission was not heard correctly due to background noise, technical issues, or other disruptions, the officer can use "10-9" to ask the sender to repeat their message. This code is vital for maintaining effective communication in the field, allowing officers to stay informed and make informed decisions based on accurate information.