C in Morse Code: What It Means and How to Remember It

C in Morse code is -.-. dash, dot, dash, dot commonly remembered as dah-di-dah-dit or long-short-long-short. The pattern alternates cleanly between dash and dot, which makes its rhythm one of the easier four-signal letters to lock in once you hear it a few times. This guide covers the rhythm, timing, the letters C is most often confused with, and a bit of real history behind why C looks the way it does today.

C is one small piece of a much larger system for the full picture of how every letter fits together, the complete Morse code guide covers the basics before you zoom into individual letters.

The Morse code for C is:

C = -.-.

It’s built from four alternating signals — dash, dot, dash, dot — always sent in that exact order. Stop one signal early and you get a different letter entirely (more on that below).

C is part of International Morse Code, the same standardized system covered on the main Morse code guide.

Unlike most letters, C didn’t always look the way it does today. When Samuel Morse and Alfred Vail built their original code in the 1830s and 40s now known as American Morse or Railroad Morse several letters, including C, O, R, Y, and Z, used a short internal pause inside the signal itself rather than a clean run of dots and dashes.

That worked fine on physical telegraph sounders, where operators could hear fine timing differences, but it caused real confusion once radio came along, where those subtle internal pauses were much harder to judge. In 1848, German engineer Friedrich Clemens Gerke revised the system into what became International Morse Code, replacing C’s old paused pattern with the clean, unambiguous -.-. used worldwide today.

C also carries some living history in modern ham radio: it’s the first letter of CQ, the near-universal signal amateur radio operators send to mean “calling any station, please respond.” Because CQ opens so many radio contacts, C is one of the most frequently transmitted letters in the hobby even now.

However you’re using it — on paper, out loud, or over a signal — the pattern for C never changes.

Written: -.-. Spoken rhythm: dah-di-dah-dit (long → short → long → short) Tapped, flashed, or toned: long pulse, short pulse, long pulse, short pulse

When C appears next to other letters, a space separates each letter so the pattern stays readable:

CAT = -.-. .- –

If reading “-.-. .- -” off the page doesn’t click yet, running it through the Morse code audio translator turns it into the actual long-short-long-short tone pattern, and the Morse code translator will convert any word you type into its dot-dash form so you can see C next to other letters instantly.

Timing is what keeps the two dashes and two dots inside C distinguishable from each other:

So the full duration pattern for C reads 3-1-3-1. Transmission speed can vary, but that ratio stays fixed the same timing system that governs every letter across the full Morse code alphabet, not just C.

C is easy to confuse with a few other letters, since Morse reuses the same basic signals in different lengths and orders. Mixing these up is the most common beginner mistake with C.

Three comparisons matter most:

• C vs. K — identical for the first three signals (dash-dot-dash), but C adds one final dot. Stop too early and you’ve sent K instead of C.
• C vs. R — they share the same signal types but start differently: C opens with a dash, R opens with a dot.
• C vs. Y — both begin dash-dot-dash, but C closes with a single dot while Y closes with two dashes.

For the complete picture of how C fits alongside every other character, see the full Morse code alphabet.

C doesn’t change no matter what surrounds it — only the spacing between letters does:

These are just a starting point. Once single letters feel automatic, a much larger set of Morse code words is worth practicing — including common phrases like HELLO or GOOD MORNING. That’s also the point where beginners start wondering how experienced Morse code operators hear words as whole rhythms instead of decoding letter by letter — the natural next skill after this one.

C in Morse code is -.-. — dash, dot, dash, dot, or dah-di-dah-dit. The fastest way to make it permanent isn’t re-reading the symbol, it’s practicing the rhythm by ear or by tapping — especially alongside K, R, and Y, its closest look-alikes — until -.-. stops feeling like a code to solve and starts feeling like a sound you simply recognize.