In APCO 10-codes, 10-10 means "Negative."
This code is used to indicate a negative response or to deny a request. It is often employed in radio communications to succinctly convey that something is not the case or to decline an action. For example:
- Officer: "Do you have eyes on the suspect?"
- Response: "10-10, I do not see him."
The use of 10-10 helps streamline communication by providing a clear and concise way to convey negative responses, which is especially important in high-pressure situations.