Morse code alphabet: the chart, the rules and how to learn it
Updated · Plixoo
Short answer
Morse code writes each letter and number as a short pattern of dots and dashes: A is .-, E is a single dot, T is a single dash, and SOS is ... --- .... A dash lasts three times as long as a dot, the gap between letters is three dots long and the gap between words is seven. The most common letters in English were given the shortest codes on purpose, the same idea modern data compression uses. The quickest way to learn it is by sound rather than by reading a chart, starting with the letters E, T, A, N, I and M.
The Morse code alphabet
This is International Morse code, the version used worldwide. A dot is often called a 'dit' and a dash a 'dah', because learning the sound is easier than learning the picture.
- A .- B -... C -.-. D -.. E . F ..-.
- G --. H .... I .. J .--- K -.- L .-..
- M -- N -. O --- P .--. Q --.- R .-.
- S ... T - U ..- V ...- W .-- X -..-
- Y -.-- Z --..
- 1 .---- 2 ..--- 3 ...-- 4 ....- 5 .....
- 6 -.... 7 --... 8 ---.. 9 ----. 0 -----
The timing rules
Morse is a code of time, not marks. A dot is one unit long and a dash is three units. Inside a letter, the gap between signals is one unit; between letters it is three units; between words it is seven. Get the gaps wrong and '..' (I) and '. .' (E E) sound identical, which is why careful spacing matters as much as the signals themselves.
Why E is a single dot
When Samuel Morse and Alfred Vail designed the code in the 1830s and 1840s, they gave the shortest patterns to the most common letters. The story usually told is that they estimated letter frequency by counting the pieces of type in a printer's cases. E, the most common letter in English, became a single dot and T a single dash, while rare letters such as Q and Z got four signals.
That makes typical messages shorter to send. Computers use exactly the same idea today: compression formats give short codes to common patterns and long codes to rare ones, which is part of how a zip file shrinks.
How to learn Morse code
Learn by ear, not by eye. If you memorise a chart, you end up translating each sound into dots and dashes and then into a letter, which is slow. Instead, listen to each letter at full speed until the sound itself means the letter, and let the gaps between letters be longer while you learn. Start with a few letters - E, T, A, N, I, M - and add two more only when you recognise those instantly.
Is Morse code still used?
Yes, in a few places. Amateur radio operators still use it because a Morse signal gets through when voice would be lost in noise. Many aviation radio beacons identify themselves with a short Morse call sign. And because it needs only one switch, Morse can be a way for people with very limited movement to type.
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Frequently asked questions
What does SOS stand for in Morse code?
Nothing. SOS was chosen as the international distress signal because its pattern, ... --- ..., is easy to send and impossible to mistake. It is sent as one continuous pattern, not as three separate letters.
How long does it take to learn Morse code?
Most people can learn to recognise all 26 letters by sound in a few weeks of 10 to 15 minutes a day. Receiving at conversational speed takes longer, usually a few months of regular practice.
What is 'I love you' in Morse code?
I love you is .. / .-.. --- ...- . / -.-- --- ..- , with the slashes marking the longer gaps between words.
Is Morse code a kind of binary?
Not quite. It uses two signals, but the length of the gaps also carries meaning, so it really has more than two symbols. It is better described as an early digital code, and a clear ancestor of the ideas behind modern computing.
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