In Morse code, the letter "O" is represented by the sequence --- This translates to:

Three dashes (---).

In other words, it consists of three long signals (dashes). This combination is used in Morse code to denote the letter "O" in both telegraphy and radio communication.

Morse Code Alphabets

Letter a in Morse Code

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Letter o in Morse Code

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Letter O in Morse Code

Morse Code Alphabets