SOS in Morse Code
... --- ...
SOS is the most famous signal in Morse code — and the only one on this list that is an internationally recognized distress call. Written ... --- ..., it is three dots, three dashes, three dots, sent as one continuous run with no letter gaps. Adopted at the 1906 Berlin radiotelegraph convention, it was chosen not because it stands for anything but because the pattern is impossible to mistake, even through static, surf, or fading light.
Letter-by-Letter Breakdown
| Letter | Morse | Sound (di / dah) |
|---|---|---|
| S | ... | di-di-dit |
| O | --- | dah-dah-dah |
| S | ... | di-di-dit |
Although we write it as three letters, SOS is really a single prosign: ...---... with no pauses between the S and O segments. Three short signals, three long ones, three short again. That symmetry — fast, slow, fast — is what makes it leap out of noise and stay readable whether it's tapped, flashed, or buzzed.
How to Send “SOS” in Morse Code
SOS works through any on-off medium. Flash it with a flashlight or mirror, blast it on a whistle, or tap it on a hull or pipe: three quick, three long, three quick, then a pause and repeat. Search-and-rescue crews are trained to recognize it instantly. Unlike the other phrases here, SOS is a genuine call for help — use it only in a real emergency.
Type it
Enter "SOS" in any Morse translator to see ... --- ... appear instantly — the fastest way to check the pattern.
Tap it
Tap the rhythm on a hand or table: short taps for dots, longer presses for dashes, with a clear pause between letters.
Blink it
Signal it with your eyes or a subtle nod — quick for a dot, held for a dash — a silent way to pass "SOS" across a room.
Flash it
Use a flashlight or phone light: a brief flash is a dot, a long flash is a dash. Press Play above to hear the timing first.
Frequently Asked Questions
What is SOS in Morse code?+
SOS in Morse code is ... --- ... — three dots, three dashes, three dots, run together as a single signal with no gaps between the letters. It is the internationally recognized distress call, adopted in 1906 and still understood worldwide today.
Does SOS stand for "Save Our Souls"?+
No. SOS doesn't stand for anything; "Save Our Souls" and "Save Our Ship" are backronyms invented later. The letters were chosen purely because their combined Morse pattern — three dots, three dashes, three dots — is simple, symmetrical, and unmistakable, even in poor conditions.
How do you signal SOS in an emergency?+
Send three short signals, three long signals, and three short signals, then pause and repeat. You can flash it with a light, sound it on a whistle, or tap it on any hard surface. Because it's a real distress call, only use SOS when you genuinely need rescue.
Related Phrases
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