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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.
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 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.
Find out the emergency numbers for police, ambulance, fire and other services in different countries and regions. Compare the global and local variations of 112, 911, 999 and other codes.
Learn about the SDE codes, a set of 18+1 codes used by the Home Office in the UK to classify an individual's ethnicity according to their self-definition. The codes are also called "18 + 1" codes, as there are 18 of them, plus one code (NS) for "not stated".
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.
NYPD is the largest municipal police department in the US, serving New York City since 1845. Learn about its history, organization, rank structure, services, technology, vehicles, and controversies.