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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 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.
CB slang is the distinctive language used by Citizens Band radio users, especially truck drivers in the US. Learn the meanings of common terms such as Smokey, Bear, 18/18 wheeler, and more.
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.
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.
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 techniques and standards used to communicate over two-way radios in various applications and domains. Find out how to use voice, speech, microphone, and brevity codes, and how to comply with international and national regulations.