What does "10-9" mean in police radio communication?

In police radio communication, "10-9" is a code used to request that a message be repeated. This is crucial in the field, where clarity is vital for ensuring that all officers receive accurate information. When an officer might have difficulty hearing or understanding a transmission due to static, distance, or other factors, using "10-9" allows them to ask the sender to repeat their message, reducing the likelihood of miscommunication.

Understanding this code is essential for effective communication in a high-pressure environment, where every piece of information can be critical for safety and operational efficiency. The other choices represent different radio codes, but they serve different purposes within law enforcement communication protocols.