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  2. Duress code - Wikipedia

    en.wikipedia.org/wiki/Duress_code

    For cases where verbal communication (e.g. via cell phone) is possible with family member or friend, a covert phrase can be used to signal duress. In the slim chance that a captor allows the person in duress to use their cell phone (e.g. to obtain a PIN), there is a limited opportunity to use a duress code.

  3. Distress signal - Wikipedia

    en.wikipedia.org/wiki/Distress_signal

    A distress signal indicates that a person or group of people, watercraft, aircraft, or other vehicle is threatened by a serious or imminent danger and requires immediate assistance. [1]: PCG D−3 Use of distress signals in other circumstances may be against local or international law.

  4. Emergency service response codes - Wikipedia

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

    These codes were rarely uniform even between local agencies. Most used “10-4” to mean “acknowledged”, for example, but some agencies used it as “message ends”. A “Signal 30” could be a fatal car crash or any death, depending on local usage. Plain language helps ensure critical clarity in emergencies. It is the clear standard.

  5. Ten-code - Wikipedia

    en.wikipedia.org/wiki/Ten-code

    Used when signal received is not clear. In most cases, try to add the specific trouble. Example: "Unreadable, background noise." Loud and Clear Self-explanatory Stop Transmitting Copy, Copies Used to acknowledge message received. Unit radio identifier must also be used. Example: "Engine 2675, copies." Affirmative Yes Negative No Respond, Responding

  6. Police radio code - Wikipedia

    en.wikipedia.org/wiki/Police_radio_code

    A police radio 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 ...

  7. 6 Behaviors That Signal a Person's Lonely, According to ... - AOL

    www.aol.com/6-behaviors-signal-persons-lonely...

    6 Behaviors That Signal a Person’s Lonely. ... The Pink Stuff is a must-have for all cleaning fanatics. AOL. This anti-aging eye gel is a must-have for winter — and it's 20% off right now.

  8. Emergency position-indicating radiobeacon - Wikipedia

    en.wikipedia.org/wiki/Emergency_position...

    The alarm signal is defined as an AM signal (A3X and/or N0N emissions), containing a swept tone ranging from 300 Hz to 1600 Hz (upwards), with 2–4 sweeps per second. PLBs shall sweep upward. [28] [29] PLB alerts are passed to State and Local agencies. [10] They must be registered to a specific person (with NOAA in the U.S.).

  9. Military communications - Wikipedia

    en.wikipedia.org/wiki/Military_communications

    A signal corps is a military branch, responsible for military communications (signals). Many countries maintain a signal corps, which is typically subordinate to a country's army. Military communication usually consists of radio, telephone, and digital communications.