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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 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.
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 different formats and codes for reporting the strength and quality of radio signals and voice communications. The R-S-T system uses 1 to 5 for readability and 1 to 9 for signal strength, while the SINPO and SINPEMFO codes use 1 to 5 for each factor.
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Learn the history and usage of the most widely used set of clear-code words for communicating the letters of the Roman alphabet, such as Alpha, Bravo, Charlie and Delta. The code words are also known as NATO spelling alphabet, ICAO phonetic alphabet and radiotelephony spelling alphabet.