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SOS — Morse Prosign

International distress signal. Sent as a single unbroken sequence, not three separate letters.

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What does the SOS prosign mean?

International distress signal. Sent as a single unbroken sequence, not three separate letters.

What is the Morse code for SOS?

The Morse code for SOS is: ...---.... Prosigns are sent as a single unbroken sequence, without the normal letter gaps.

When do you use SOS in Morse code communication?

SOS is a procedural signal (prosign) used to manage the flow of Morse code communication. International distress signal. Sent as a single unbroken sequence, not three separate letters.

Other Prosigns

CQ -.-. --.-

General call to all stations. Used to initiate contact with any available operator.

DE -.. .

"From" — identifies the sending station. Used as: CQ CQ DE [callsign].

AR .-.-.

End of transmission. Signals that the message is complete.

SK ...-.-

End of contact (Silent Key). Signals the end of a communication session.

BT -...-

Break/pause separator between sections of a message. Equivalent to a new paragraph.

KN -.--.

Invitation to a specific station only. "Go ahead, named station only."

Explore all prosigns and the full Morse alphabet → อะคาเดมี