What does the code "10-4" signify in police communication?

The code "10-4" is widely recognized in police communication and signifies "Message Received." This phrase indicates that the message being conveyed has been understood and acknowledged by the recipient. The use of such codes helps facilitate efficient and clear communication among officers, allowing them to respond quickly in various situations.

In the context of police communication, the clarity provided by using codes like "10-4" enhances teamwork and coordination. It is crucial for officers to confirm understanding, especially in high-pressure scenarios where every second counts. This code serves as a concise acknowledgment, streamlining communications without unnecessary elaboration.

In contrast, the other options represent different meanings not applicable to "10-4." For instance, "Out of Service" pertains to units that are not currently available for assignments, while "Repeat" is a directive for something to be stated again, and "Location" refers to the physical positioning of a unit or incident, none of which are related to the acknowledgment of received messages.