SOS is famous because its Morse pattern is distinctive and easy to recognise: three short signals, three long signals and three short signals. It is listed as a distress signal in the international maritime rules. The U.S. Coast Guard's Navigation Center includes “a signal made by any signalling method consisting of the group ...---... (SOS) in the Morse Code” among the signals that indicate distress and need of assistance.
Why was SOS chosen?
The pattern is short, symmetrical and hard to mistake when sent with Morse timing. It can be transmitted as radio tones and, where appropriate, by other methods such as light. SOS was adopted as the international distress signal at the International Radiotelegraph Conference held in Berlin in 1906, and it is closely associated with the history of maritime communication.
Does SOS stand for “Save Our Souls” or “Save Our Ship”?
Those phrases are popular explanations, but SOS was selected as a signal pattern, not as an official initialism. The letters are simply a convenient way to name the signal in writing. What matters is the recognisable Morse sequence, not an expanded phrase.
How do you write SOS in Morse code?
The written pattern is ...---.... Many learning charts display it as ... --- ... to make the three groups easier to see. In a real distress transmission, follow the applicable signalling procedure; inserting letter gaps is not the same as the recognised continuous signal.
| Example | Written pattern | Note | Listen |
|---|---|---|---|
| SOS (as sent) | ...---... | One continuous group | |
| S O S (letters) | ... --- ... | Three separate characters |
Can I use a flashlight to send SOS?
A light can demonstrate Morse signals, but a DIY flashlight or phone tool is not a certified emergency system. It should not replace local emergency services, marine radio, a personal locator beacon or other appropriate equipment. Do not flash lights at aircraft, drivers or people who may be affected by flashing light. For practice, use the Morse Orbit screen-flash feature only in a safe setting and follow its warning — see how to send Morse code with a flashlight.
Morse Orbit is an educational tool, not an emergency communication device. In an emergency, call your local emergency number or use certified distress equipment.
Try the SOS signal
Use the Morse Orbit SOS tool to hear the sequence, see its timing and flash it on screen. It is intended for learning and demonstration, not as a substitute for approved distress equipment. You can also type any message into the translator.
Try it in Morse Orbit
Hear, see and flash SOS
Play SOS as it is sent, compare it with the three separate letters and inspect the timing.
Open the SOS toolCommon questions
What is SOS in dots and dashes?
SOS is ...---... — three dots, three dashes, three dots — sent as one continuous group.
Is SOS an abbreviation?
No official phrase is represented by the letters. “Save Our Souls” and “Save Our Ship” are later mnemonic explanations.
Is SOS still an official distress signal?
Yes. Annex IV of the international collision regulations, published by the U.S. Coast Guard Navigation Center, still lists the SOS Morse group as a distress signal.
About this guide
Written and published by Morse Orbit, a free educational Morse code site. Facts are checked against the sources listed, and Morse patterns come from the same International Morse (ITU-R M.1677-1) engine as our tools.
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