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10-4 is a police code for "okay" or "acknowledged" in the United States. Learn about the origin, types, and examples of police codes, such as California's Hundred Code and 10-codes.
Ten-codes are abbreviated phrases used by public safety officials and CB radio enthusiasts to communicate quickly and clearly. Learn about the history, meaning and usage of ten-codes, such as 10-4 (understood), 10-33 (officer needs help) and 10-7 (out of service).
Learn how different countries and agencies use predefined systems to describe the priority and response assigned to calls for service. Compare the codes and methods used by emergency services in the United States, the United Kingdom, and other jurisdictions.
Learn the history and meaning of CB slang, the distinctive anti-language used by truck drivers and CB radio users. Find out what "10-4 good buddy" means and other terms for law enforcement, trucks and other vehicles.
Learn about the history and usage of the APCO phonetic alphabet, a competing spelling alphabet to the ICAO radiotelephony alphabet, used by many U.S. law enforcement agencies. Compare the APCO alphabet with other variations and see examples of code words for each letter.
End of Watch Call is a ceremony for police officers who die in the line of duty or from illness. It involves a radio dispatcher issuing two calls to the officer, followed by silence, and mentioning the officer's honors.
Find out the emergency numbers for police, ambulance, fire and other services in different countries and regions. Compare the common numbers such as 112, 911 and 999 with the unique ones for each country.
An all-points bulletin (APB) is an electronic information broadcast sent from one sender to a group of recipients, to rapidly communicate an important message. The term is also known as BOLO (be on the look-out) in policing, and has been used for various purposes such as catching wanted fugitives, finding missing persons, and counter-terrorism.