What does the 10-code '10-9' signify in security communication?

The 10-code '10-9' signifies "Repeat message" in security communication. This code is part of a standardized set of communications used to enhance clarity and efficiency in radio transmissions among security personnel. When an officer or security guard uses the '10-9' code, they are requesting that the last message transmitted be repeated, which is critical in situations where clarity is essential, and misunderstandings could lead to significant issues. This request ensures that all parties involved have the correct information and helps maintain effective communication in dynamic and potentially high-pressure environments.