What Is S in Morse Code?
The Morse code for S is ..., a sequence of 3 dots and 0 dashes. In international Morse code (the ITU standard), each letter has a unique combination of dots (·) and dashes (−). S is three dots; with O (---) it makes SOS, the universal distress call.
When you hear or read “morse code s”, “morse code for s”, “s morse code”, or “letter s in morse code”, the answer is always the same 3-signal pattern: ....
NATO Phonetic Word for S
In the NATO phonetic alphabet, the letter S is spoken as Sierra. This pairing — Morse code ... with the spoken word Sierra — is used by aviation, military, and amateur radio operators worldwide for unmistakable communication.
Practice: What Is the Morse Code for S?
Select the correct Morse code for S:
How to Tap Letter S in Morse Code
To transmit Letter S (...), use this sequence:
ITU Timing Rules
- Dot (·) = 1 unit
- Dash (−) = 3 units (3× longer)
- Signal gap = 1 unit
- Letter gap = 3 units
- Word gap = 7 units
Timing Reference Table
| Speed | Dot | Dash | Letter gap | Word gap |
|---|---|---|---|---|
| 5 wpm | 240ms | 720ms | 720ms | 1680ms |
| 10 wpm | 120ms | 360ms | 360ms | 840ms |
| 17 wpm (this page) | 70ms | 210ms | 210ms | 490ms |
| 20 wpm | 60ms | 180ms | 180ms | 420ms |
How to Remember Letter S in Morse Code
S is three dots — "di-di-dit".
NATO phonetic word: Sierra — pair the spoken word with the rhythm to remember faster.
Frequently Asked Questions — Letter S in Morse Code
S in Morse code is .... The letter S uses 3 dots and 0 dashes, the standard ITU pattern.
The Morse code for S is .... Tap the 3 signals in sequence with a one-unit gap between each.
To send letter S: short press, then short press, then short press. The NATO phonetic name for S is Sierra.
... means the letter S in international Morse code (the ITU standard used worldwide for amateur radio and communication).
The NATO phonetic alphabet word for S is Sierra. It pairs with the Morse code ... for clear voice and signal communication.
Related Morse Code Letters
Other letters often learned alongside S: