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  2. Distress signal - Wikipedia

    en.wikipedia.org/wiki/Distress_signal

    Distress signals are communicated by transmitting radio signals, displaying a visually observable item or illumination, or making a sound audible from a distance. 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]:

  3. 2182 kHz - Wikipedia

    en.wikipedia.org/wiki/2182_kHz

    2182 kHz is analogous to channel 16 on the marine VHF band, but unlike VHF which is limited to ranges of about 20 to 50 nautical miles (40 to 90 km) depending on antenna height, [3] communications on 2182 kHz and nearby frequencies have a reliable range of around 50 to 100 nautical miles (90 to 190 km) during the day and 150 to 300 nautical miles (280 to 560 km) or sometimes more at night.

  4. Ring-tailed lemur vocalizations - Wikipedia

    en.wikipedia.org/wiki/Ring-tailed_lemur...

    Infant distress call; expresses discomfort and/or distress Infant Whit, variant 2 sample 1 ⓘ sample 2 ⓘ Infant high-intensity distress call Infant Yelp sample 1 ⓘ sample 2 ⓘ sample 3 ⓘ Serves both as an affiliative and distress vocalization in eliciting prompt retrieval by the mother

  5. SOS - Wikipedia

    en.wikipedia.org/wiki/SOS

    SOS is a Morse code distress signal ( ), used internationally, originally established for maritime use.In formal notation SOS is written with an overscore line (SOS), to indicate that the Morse code equivalents for the individual letters of "SOS" are transmitted as an unbroken sequence of three dots / three dashes / three dots, with no spaces between the letters. [1]

  6. Radio silence - Wikipedia

    en.wikipedia.org/wiki/Radio_silence

    Radio silence can be used in nautical and aeronautical communications to allow faint distress calls to be heard (see Mayday). In the latter case, the controlling station can order other stations to stop transmitting with the proword "Seelonce Seelonce Seelonce". (The word uses an approximation of the French pronunciation of the word silence ...

  7. CQD - Wikipedia

    en.wikipedia.org/wiki/CQD

    The first US ship to send a wireless distress call in 1905 simply sent HELP (in both International Morse and American Morse code). [3]: 218 On 7 December 1903, Ludwig Arnson was a wireless operator aboard the liner SS Kroonland when the ship lost a propeller off the Irish coast. His call of CQD brought aid from a British cruiser.

  8. Alarm signal - Wikipedia

    en.wikipedia.org/wiki/Alarm_signal

    Alarm calls have been studied in many species, such as Belding's ground squirrels. Characteristic 'ticking' alarm call of a European robin, Erithacus rubecula. In animal communication, an alarm signal is an antipredator adaptation in the form of signals emitted by social animals in response to danger.

  9. Corrupted Blood incident - Wikipedia

    en.wikipedia.org/wiki/Corrupted_Blood_incident

    The Corrupted Blood debuff being spread among characters in Ironforge, one of World of Warcraft's in-game cities. The Corrupted Blood incident (also known as the World of Warcraft pandemic) [1] [2] took place between September 13 and October 8, 2005, in World of Warcraft, a massively multiplayer online role-playing game (MMORPG) developed by Blizzard Entertainment.