What Is M in Morse Code?
The Morse code for M is --, a sequence of 0 dots and 2 dashes. In international Morse code (the ITU standard), each letter has a unique combination of dots (·) and dashes (−). M is two dashes, the partner of N (-.).
When you hear or read “morse code m”, “morse code for m”, “m morse code”, or “letter m in morse code”, the answer is always the same 2-signal pattern: --.
NATO Phonetic Word for M
In the NATO phonetic alphabet, the letter M is spoken as Mike. This pairing — Morse code -- with the spoken word Mike — is used by aviation, military, and amateur radio operators worldwide for unmistakable communication.
History of Letter M in Morse Code
The letter M in Morse code is -- — two dashes, and nothing else. It is one of the shortest codes in the International Morse alphabet, sharing the two-signal tier with only three other letters: A (.-), I (..), and N (-.). M was part of the original system developed by Samuel Morse and Alfred Vail in the 1840s and was standardised globally by the International Telecommunication Union (ITU) in 1865.
The -- pattern reflects Morse's foundational design principle: short codes for common letters. M is the thirteenth most frequent letter in English, and its two-dash code keeps it swift to transmit even at low operating speeds. At any keying rate, -- arrives as two deliberate, equal-weight beats — a pattern so simple that even absolute beginners recognise it within minutes of their first listening session.
M is the pure-dash counterpart to I (..), which is the only two-signal letter composed entirely of dots. Together they define the extremes of the two-signal tier — maximum heaviness versus maximum lightness — making their contrast one of the most fundamental tonal distinctions in all of Morse code training.
Real-World Uses of M in Morse Code
M appears in CW greetings, call signs, common abbreviations, and Q-codes. Here are the most frequent real-world scenarios where -- is transmitted:
- GM / GE / GA greetings: "GM" (good morning) opens virtually every daytime CW contact — --. -- — making -- one of the first patterns sent each operating session
- QRM (man-made interference): --.- .-. -- — one of the most frequently invoked Q-codes on any crowded HF band; M closes it
- M-prefix call signs: UK amateur stations hold M-prefix licences alongside G — M0ABC, M6XYZ — common on European bands
- RST reports: "MANY TNX" (many thanks) and "MOST" are common ragchew phrases; M opens both, firing -- early in each sentence
- WPM (words per minute): The standard measure of CW speed — keyers and logging software display WPM constantly; operators discuss speed in every on-air exchange
- Military heritage: "M" was used in early military Morse for "Message" in procedural preambles — -- marked the start of formal traffic handling on military nets
QRM (--.- .-. --) is the most frequently voiced complaint on any busy HF band. Interference is a constant reality of radio operation, and every operator learns to send and recognise QRM within their first week on air. M closes the Q-code with its simple double-dash, making -- one of the most contextually reinforced two-signal patterns in practical CW operation.
Morse Code Alphabet Chart — Letter M in Context
Every letter in International Morse Code uses between one and four signals. M (--) is a two-signal letter — the only one composed entirely of dashes. See where it sits among the full alphabet:
| Letter | Morse Code | Signals | Sound Pattern |
|---|---|---|---|
| A | .- | 2 | dit dah |
| B | -... | 4 | dah dit dit dit |
| C | -.-. | 4 | dah dit dah dit |
| D | -.. | 3 | dah dit dit |
| E | . | 1 | dit |
| F | ..-. | 4 | dit dit dah dit |
| G | --. | 3 | dah dah dit |
| H | .... | 4 | dit dit dit dit |
| I | .. | 2 | dit dit |
| J | .--- | 4 | dit dah dah dah |
| K | -.- | 3 | dah dit dah |
| L | .-.. | 4 | dit dah dit dit |
| M | -- | 2 | dah dah |
| N | -. | 2 | dah dit |
| O | --- | 3 | dah dah dah |
| P | .--. | 4 | dit dah dah dit |
| Q | --.- | 4 | dah dah dit dah |
| R | .-. | 3 | dit dah dit |
| S | ... | 3 | dit dit dit |
| T | - | 1 | dah |
| U | ..- | 3 | dit dit dah |
| V | ...- | 4 | dit dit dit dah |
| W | .-- | 3 | dit dah dah |
| X | -..- | 4 | dah dit dit dah |
| Y | -.-- | 4 | dah dit dah dah |
| Z | --.. | 4 | dah dah dit dit |
M (--) is the dot-dash mirror of I (..) — both are two-signal pure letters, one all-dashes and one all-dots. Together with E (.) and T (-), they form the four-letter foundation of Morse code: two single-signal letters and two double-signal letters that between them represent all four possible signal-type combinations. Mastering E, T, I, and M simultaneously is the single most efficient foundation for any Morse learning programme.
Practice Phrases Containing the Letter M
Drill -- in context, focusing on the two equal, deliberate dashes and the clear inter-letter gap that follows. Work through these phrases until the pattern flows without thought:
| Phrase | Morse Code |
|---|---|
| M | -- |
| MM | -- -- |
| GM (good morning) | --. -- |
| QRM (interference) | --.- .-. -- |
| M0ABC (call sign) | -- ----- .- -... -.-. |
| MAX | -- .- -..- |
| MANY TNX | -- .- -. -.-- - -. -..- |
Make GM (--. --) your daily opener. Every morning operating
session begins with a greeting, and GM puts G and M together in a natural two-letter phrase
that drills both a three-signal and a two-signal letter simultaneously. After a week of
opening contacts with GM, -- will be one of your fastest and most automatic patterns.
Tips for Memorising Letter M in Morse Code
Two dashes — M is one of the simplest patterns in Morse code. Here are four techniques to make -- completely automatic:
- Scale up from T (-): T is a single dash. M is two dashes. If you know T, M is simply T repeated twice. Practise - then -- in a loop — one then two — until the doubling feels as natural as counting. This mnemonic also reinforces T simultaneously, giving you two letters for the price of one drill.
- The "DAH-DAH" chant: Say "DAH-DAH" with equal weight on both beats. Unlike K (-.-) or G (--.) where the rhythm is uneven, M is perfectly uniform — two identical heavy beats. That uniformity makes it one of the easiest patterns to send cleanly, because there is no internal timing variation to manage.
- Contrast with I (..): I is two dots and M is two dashes — identical length, opposite weight. Send .. then -- in a loop. The contrast is so total — fast and light vs slow and heavy — that both patterns lock in within minutes. This is the most fundamental two-signal contrast drill in Morse code learning.
- Build the dash ladder: T is one dash (-), M is two (--), O is three (---). Practise - -- --- as a rising sequence, feeling each letter grow by one dash. This three-step drill locks in T, M, and O together — three of the most important dash-dominant letters in the alphabet — and builds a durable mental model of how dash quantity shapes letter identity.
Practice: What Is the Morse Code for M?
Select the correct Morse code for M:
How to Tap Letter M in Morse Code
To transmit Letter M (--), use this sequence:
ITU Timing Rules
- Dot (·) = 1 unit
- Dash (−) = 3 units (3× longer)
- Signal gap = 1 unit
- Letter gap = 3 units
- Word gap = 7 units
Timing Reference Table
| Speed | Dot | Dash | Letter gap | Word gap |
|---|---|---|---|---|
| 5 wpm | 240ms | 720ms | 720ms | 1680ms |
| 10 wpm | 120ms | 360ms | 360ms | 840ms |
| 17 wpm (this page) | 70ms | 210ms | 210ms | 490ms |
| 20 wpm | 60ms | 180ms | 180ms | 420ms |
How to Remember Letter M in Morse Code
M is "MMMM" — two long dashes.
NATO phonetic word: Mike — pair the spoken word with the rhythm to remember faster.
Frequently Asked Questions — Letter M in Morse Code
M in Morse code is --. The letter M uses 0 dots and 2 dashes, the standard ITU pattern.
The Morse code for M is --. Tap the 2 signals in sequence with a one-unit gap between each.
To send letter M: long press, then long press. The NATO phonetic name for M is Mike.
-- means the letter M in international Morse code (the ITU standard used worldwide for amateur radio and communication).
The NATO phonetic alphabet word for M is Mike. It pairs with the Morse code -- for clear voice and signal communication.
Related Morse Code Letters
Other letters often learned alongside M: