O in Morse Code
O in Morse code is ---. It sounds like three steady dahs and forms the middle of SOS.
Direct answer
Letter OO in Morse code is ---. It sounds like three steady dahs and forms the middle of SOS.
Plain text
O
Morse
---
Rhythm
dah-dah-dah
Quick breakdown
O is spoken as dah-dah-dah.
What O is in Morse code
The letter O is a three-dash Morse character. It is all long marks, but it is not the digit zero, which has five dashes.
- Character
- O
- Dot dash pattern
- ---
- Spoken rhythm
- dah-dah-dah
How it sounds
Three steady dahs
O should sound longer and heavier than S: dah-dah-dah. Count three long marks, then stop.
In SOS, O is the three-dash center between two S letters.
How to type it
Use keyboard-safe marks
Type --- with periods for dots and hyphens for dashes.
Keep letter gaps visible
Add a space after the letter when typing a word so the next Morse character stays separate.
Common mistakes and confused letters
Small spacing or mark-count changes can turn one Morse letter into another.
O is ---. The digit 0 is -----, so count the dashes when reading copied Morse in codes, dates, or call signs.
M has two dashes
M is --. O adds one more dash, making three total.
Words that contain O
Use short words to practice the letter in real context instead of memorizing it only as a lookup.
O
---
O by itself is the cleanest way to check the pattern.
SOS
... --- ...
SOS gives you O inside a short word instead of as an isolated lookup.
CODE
-.-. --- -.. .
CODE gives you O inside a short word instead of as an isolated lookup.
ZERO
--.. . .-. ---
ZERO gives you O inside a short word instead of as an isolated lookup.
Mini practice
Alternate O and zero aloud: three dahs, then five dahs. Then decode SOS and CODE 0 to practice letter and number context.
Listening drill
Play O, M, and zero. O has three dahs, M has two, and zero has five.
Typing drill
Type --- for O, -- for M, and ----- for zero. Use CODE 0 to practice context.
Keep practicing O
Compare nearby letters, hear the signal, then move from lookup to recall in the tools.
O in Morse Code FAQ
Quick answers for spacing, supported characters, and decoding pasted Morse.
What is O in Morse code?>
O in Morse code is three dashes: ---.
Is O the same as zero in Morse?>
No. O is three dashes, while the digit 0 is five dashes.
How do you say O in Morse rhythm?>
O is spoken as dah-dah-dah.
Why is O useful for beginners?>
O gives beginners a clean three-dash pattern and pairs naturally with S in SOS.
