The Exact Pattern
... --- ... — three dots (S), three dashes (O), three dots (S). Written with spaces between the three letter groups.
SOS in Morse code is … — … — three dots, three dashes, three dots. Play it, copy it, or send it with light and tap using this free tool.
Short tap = dot · hold longer = dash
SOS is three letters — not a single special symbol. Click each to hear its rhythm.
The international distress signal — recognised worldwide, not an abbreviation of “save our ship”.
... --- ... — three dots (S), three dashes (O), three dots (S). Written with spaces between the three letter groups.
SOS is sent as S, then O, then S. Each letter keeps its normal Morse spacing; the distress call is memorable because the rhythm is easy to recognise.
Do not send nine symbols without gaps as one block. Standard practice is ... --- ... with letter spacing — the same pattern this tool generates when you type SOS.
How the distress pattern fits standard Morse timing rules.
No gap between dots and dashes inside S (...) or O (---). Symbol gaps inside a letter follow normal Morse unit rules.
Standard letter spacing applies between the three groups — the same gap you would use between letters in any word. That is why written SOS is ... --- ... with spaces, not one continuous string.
Radio operators send SOS as three distinct letters at distress priority. In written form, spaces (and optionally slashes between words in longer messages) keep the pattern readable.
Wrong spacing turns a clear distress call into ordinary letters.
Do not send ...---... as one glued block with no letter gaps. Standard written form is ... --- ... (S, O, S).
HELP is everyday English Morse. SOS is the international distress pattern. They are not interchangeable.
S is three dits; H is four; digit 5 is five. Extra or missing dits break the recognisable rhythm.
This page is educational. Real danger needs official channels — Morse SOS remains the pattern people recognise, not a substitute for modern alerts.
Practical ways people transmit the distress pattern.
Flash short for dot, long for dash. Three short, three long, three short — with brief pauses between the S, O, and S groups. Repeat after a short pause if needed.
Knock or whistle the same rhythm. Use Hold to tap in the tool above to practise dot versus dash length before trying it by hand.
Press Play SOS on this page to hear clean timing, then match it on a key or whistle. Adjust WPM to practise recognition at different speeds.
SOS indicates grave and imminent danger where normal communication is appropriate. Modern maritime and aviation systems also use digital alerts — Morse SOS remains the universal pattern people recognise.
Adopted for clarity, not because the letters stand for a phrase.
The International Radiotelegraph Convention chose SOS as the standard distress signal from 1 July 1908. It replaced CQD on many ships but both were used during the transition.
... --- ... is unambiguous in Morse — easy to send, easy to recognise, and unlikely to be confused with ordinary traffic.
Wireless operators sent both CQD and SOS. The event fixed SOS in public memory even as voice and satellite distress systems later supplemented Morse.
Know what SOS is — and what it is not.
... --- ... — global Morse distress. Still taught for visual and backup signalling.
Spoken radio distress call — different medium, same urgency. Not Morse dots and dashes.
Earlier Marconi distress call (-.-. --.- -..). Superseded by SOS for international use but heard on early wireless traffic.
Common questions about the distress pattern.
... --- ... — three dots (letter S), three dashes (letter O), three dots (letter S). It is the international distress signal, sent as three separate letters with normal letter spacing between them.... --- ... with spaces between the S, O, and S groups. Type SOS in the Text box above and the tool fills in the correct pattern automatically.... --- ...). Mayday is the spoken voice distress call used on radio. Both mean urgent help is needed but they belong to different signalling methods.Press Play SOS above, copy the pattern, or open the full translator for any other message.
Play SOS