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  2. Ten-code - Wikipedia

    en.wikipedia.org/wiki/Ten-code

    Ten-codes, officially known as ten signals, are brevity codes used to represent common phrases in voice communication, particularly by law enforcement and in citizens band (CB) radio transmissions. The police version of ten-codes is officially known as the APCO Project 14 Aural Brevity Code.

  3. Police code - Wikipedia

    en.wikipedia.org/wiki/Police_code

    A police code is a brevity code, usually numerical or alphanumerical, used to transmit information between law enforcement over police radio systems in the United States. Examples of police codes include "10 codes" (such as 10-4 for "okay" or "acknowledged"—sometimes written X4 or X-4), signals, incident codes, response codes, or other status ...

  4. Emergency service response codes - Wikipedia

    en.wikipedia.org/wiki/Emergency_service_response...

    They generally vary but often have three basic tiers: Code 3: Respond to the call using lights and sirens. Code 2: Respond to the call with emergency lights, but without sirens. Alternatively, sirens may be used if necessary, such as to make traffic yield or when going through intersections.

  5. Traffic signal preemption - Wikipedia

    en.wikipedia.org/wiki/Traffic_signal_preemption

    Traffic signal preemption (also called traffic signal prioritisation) is a system that allows an operator to override the normal operation of traffic lights.

  6. APCO radiotelephony spelling alphabet - Wikipedia

    en.wikipedia.org/wiki/APCO_radiotelephony...

    The APCO phonetic alphabet, a.k.a. LAPD radio alphabet, is the term for an old competing spelling alphabet to the ICAO radiotelephony alphabet, defined by the Association of Public-Safety Communications Officials-International [1] from 1941 to 1974, that is used by the Los Angeles Police Department (LAPD) and other local and state law ...

  7. Color of the day (police) - Wikipedia

    en.wikipedia.org/wiki/Color_of_the_day_(police)

    The color of the day is a signal used by plainclothes officers of some police departments in the United States. It is used to assist in the identification of plainclothes police officers by those in uniform. It is used by the New York City Police Department and other law enforcement agencies.

  8. Q2B - Wikipedia

    en.wikipedia.org/wiki/Q2B

    The Q2B siren ("Q-siren") is an electromechanical siren that is produced by the Federal Signal Corporation and is most recognizable for its sound, which is trademarked, and the look of the siren.

  9. What to Watch Friday: 20/20 on how police finally caught ...

    www.aol.com/news/watch-friday-20-20-police...

    The episode will explore exactly how police caught Flores “using cutting-edge investigative techniques and groundbreaking forensic research.”

  10. Duress code - Wikipedia

    en.wikipedia.org/wiki/Duress_code

    A duress code is a covert distress signal used by an individual who is being coerced by one or more hostile persons. It is used to warn others that they are being forced to do something against their will.

  11. Distress hand signal - Wikipedia

    en.wikipedia.org/wiki/Distress_hand_signal

    A distress hand signal is a hand signal to indicate distress and need of rescue.