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Q214266

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EntityQ214266· pop 53· linked from 397 articles

Also known as save our souls, 🆘, send out Succour, distress signal, · · · – – – · · ·, dit dit dit dah dah dah dit dit dit, S̅O̅S̅

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 of three dots / three dashes / three dots, with no spaces between the letters. In International Morse Code three dots form the letter "S" and three dashes make the letter "O", so "S O S" became a common way to remember the order of the dots and dashes. IWB, VZE, 3B, and V7 form equivalent sequences, but t

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SOS morse code.png
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SOS
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🆘
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SOS
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~13 min read

Article

10 sections
Contents
  • History
  • Later developments
  • "Mayday" voice code
  • World War II suffix codes
  • Audio tone signals and automatic alarms
  • Historical SOS calls
  • See also
  • References
  • Further reading
  • External links

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 of three dots / three dashes / three dots, with no spaces between the letters. In International Morse Code three dots form the letter "S" and three dashes make the letter "O", so "S O S" became a common way to remember the order of the dots and dashes. IWB, VZE, 3B, and V7 form equivalent sequences, but traditionally SOS is the easiest to remember.

SOS, when it was first agreed upon by the International Radio Telegraphic Convention in 1906, was merely a distinctive Morse code sequence and was initially not an abbreviation. Later a backronym was created for it in popular usage, and SOS became associated with mnemonic phrases such as "save our souls" and "save our ship". Moreover, due to its high-profile use in emergencies, the phrase "SOS" has entered general usage to informally indicate a crisis or the need for action.

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