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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 about the different types and examples of police codes used in the United States, such as 10 codes, signals, incident codes, and response codes. See how codes vary by state, county, and agency, and how they are related to the California Penal Code.
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.
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 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 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.
Iowa's abbreviation is IA, according to the table of codes and abbreviations for U.S. states, federal district, territories, and other regions. The table also shows the ISO, ANSI, USPS, USCG, GPO, and AP codes for each region.
A transponder code is a four-digit code used by aircraft to identify themselves to air traffic control. This list shows the codes used in various countries and situations, such as emergency, VFR, IFR, and oceanic airspace.