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Ten-codes are abbreviated phrases used by public safety officials and CB radio users to reduce speech on the radio. 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).
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.
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.
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 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.
Learn the meaning and usage of hospital emergency codes, such as code blue for cardiac arrest, code red for fire, and code yellow for missing patient. Compare the codes across different countries and regions, such as Australia, Canada, and the UK.
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.
Brevity codes are used in various communications to convey complex information with a few words or codes. Learn about different types of brevity codes, such as military, amateur radio, maritime, aviation and police codes.