The letter S in Morse code is ... — · · ·. S is the seventh most common letter in English, which is why it received a medium 3-signal code.
How to Translate S to Morse Code
To translate S to Morse code, write .... In written form this is · · ·. When sending by sound, tap a short beep then a short beep then a short beep. The dots and dashes follow the ITU-R M.1677-1 international Morse code standard used worldwide.
Visual Signal — What is S in Morse Code?
Here is what S looks like as physical signal blocks — this is the answer to "what is S in Morse code":
Memory trick: S is three dots — the start of SOS.
S in the NATO Phonetic Alphabet
In the NATO phonetic alphabet, S is called Sierra. When spelling out a word letter by letter on radio, operators say "Sierra" to make S unmistakable from other letters that sound similar.
Words Starting With S
Click any word to hear it in Morse code:
Frequently Asked Questions
What is S in Morse code? +
S in Morse code is ..., written as · · ·. It uses 3 signals.
How do you translate S to Morse code? +
To translate S to Morse code, write .... A dot is a short signal and a dash is three times as long.
Tap short then short then short — ... (· · ·). The gap between signals within one letter is one dot length. The gap before the next letter is three dot lengths.
In the Two-Button Tap mode, press left then left then left for S. The input checks automatically when your tap count matches the code.
How Common is S in English?
S is the seventh most common letter in English. Morse code gave shorter codes to more frequent letters. S received a 3-signal code based on its frequency in everyday text.
Practice S in Morse
Start with the Learn page — S appears in a structured audio flashcard lesson. Then use practice mode for random drills. The timed quiz adds pressure that builds real recognition speed.