What Does "10-4" Mean?

There have been countless codes, jargons, and phrases used by professionals to convey information quickly and efficiently. One such phrase that has found its way into popular culture is "10-4." You might have heard it in movies, TV shows, or even while listening to a police scanner. But what does "10-4" really mean, and how did it become such an integral part of communication history? 

"10-Codes"

We need to first understand the concept of "10-codes". These codes are a system of abbreviations used primarily by law enforcement and emergency service personnel to facilitate quick and concise communication over the radio. They were developed to save time and reduce misunderstandings during radio transmissions.

The Origin and meaning of "10-4"

The "10-4" code is part of a larger set of 10-codes, each with a specific meaning. The origins of these codes can be traced back to the 1930s when the Association of Public-Safety Communications Officials (APCO) began developing them. The "10" in "10-4" refers to the category of codes reserved for common operational and tactical phrases. The number "4" stands for the specific code.

When someone says "10-4" on a radio or during a conversation, they are essentially saying, "I understand" or "Message received." It is a way to quickly acknowledge that the information or instruction has been received and comprehended. 

The Popularity of "10-4"

"10-4" became widely recognized due to its prominent use in police procedural television shows and movies. The phrase's simple yet effective meaning made it a favorite among scriptwriters, and its adoption into popular culture was inevitable. It also gained popularity among citizens who listened to police scanners and wanted to understand the lingo.

Other 10-Codes

For more 10-Codes