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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).
A military call sign is a unique identifier assigned to military communications, such as units, stations, or aircraft. Learn about the different types, conventions, and purposes of military call signs in various countries and services.
Learn about the history, equipment, and categories of military communications, or conveyance of information, by armed forces. Find out how military communications support command, control, and intelligence, and how they evolved from runners and signals to radio and satellites.
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 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 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.
Bead Window is a code word used by various military forces to indicate the last transmission potentially disclosed unauthorized information. It is one of the American standardized brevity code words for multiservice operations and does not include words unique to single service operations.
Signal operating instructions (SOI) or Communications-Electronics Operation Instructions (CEOI) are U.S. military terms for a type of combat order. They cover radio, telephone, code-words and visual signals for communications within a command.