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Learn about police codes, numerical or alphanumerical abbreviations used by law enforcement over radio systems in the U.S. See examples of 10 codes, signals, incident codes, and other types of codes, and how they vary by state, county, and agency.
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 about the history and system of the Home Office radio service, which provided radio communication for UK police and other emergency services from 1939 to 2010. Find out the four-character call signs for each police force and region, and how they were spoken and spelled.
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 the meanings and origins of various slang terms for police officers and their activities around the world. From alphabet agency to zorro, find out how different cultures and contexts shape the language of law enforcement.
Learn about the origins and development of police radio systems, and how they are used and regulated in different countries. Find out which frequencies are public and which are encrypted, and how to listen to police radio legally or illegally.
Learn about the Los Angeles Police Department's organization, functions, and specialized units. Find out the list of LAPD community stations (patrol divisions), the types and features of LAPD vehicles, and the history of LAPD's paint scheme and markings.
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. APBs are mainly used by police departments in various countries, but have also been used in fields such as politics, technology and science research.