Letter O

What is O in Morse Code?

The Morse code for O is ---.

O---

Breakdown

O consists of dash, dash, dash — 0 dot and 3 dashes. It is a fairly short signal compared with most letters.

Timing Structure

· Dot: about 1 time unit
· Dash: about 3 time units
· O takes 11 units in total: 0 dot (0 units) + 2 gaps (2 units) + 3 dashes (9 units)

Memory Trick

"dah-dah-dah" — three dashes, one of the loudest and most distinctive letters.

Example Words

OSCAR --- ... -.-. .- .-.
OPEN --- .--. . -.
OTHER --- - .... . .-.

Similar Characters

S (...)Mirror images: three dashes vs three dots.
0 (-----)O is three dashes, 0 is five — both are all dashes.

Practice This Character

Ready to test yourself? The quiz picks characters at random, so jump in and focus on O (---) when it appears.

Practice O in the Quiz