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SOS is adopted as the international distress signal.
Related Wikipedia articles
SOS
International Morse code distress signal for help
SOS is a Morse code distress signal, used internationally, originally established for maritime use. In formal notation SOS is written with an overscore line, to indicate that the Morse code equivalents for the individual letters of "SOS" are transmitted as an unbroken sequence…Source: Wikipedia (CC BY-SA)
Distress signal
Internationally recognized means for obtaining help
A distress signal, also known as a distress call, is an internationally recognized means for obtaining help. Distress signals are communicated by transmitting radio signals, displaying a visually observable item or illumination, or making a sound audible from a distance.Source: Wikipedia (CC BY-SA)