Morse code is nearly 190 years old. It has been used to transmit wartime intelligence, land aircraft, help paralysed people communicate, and — in at least one documented case — save 705 lives from a sinking ship. Most people know it as dots and dashes. They do not know the half of it.
Here are ten facts about Morse code that most people — including people who use it — do not know.
1. SOS Doesn't Stand for Anything
"Save Our Souls" is a backronym — a phrase invented after the fact to give the letters meaning. When delegates at the 1906 International Wireless Telegraph Convention in Berlin voted on the new universal distress signal, no phrase was attached to it. They simply chose ···———··· (three dots, three dashes, three dots) because the pattern was symmetrical, fast to send, and impossible to confuse with normal communication.
"Save Our Ship" came later. So did "Save Our Souls." Both sound right. Neither is the actual origin. You can hear exactly what SOS sounds like using the Morse Code Translator — type SOS and press Play.
2. A US Prisoner of War Blinked a Secret Message on Television
In 1966, US Navy Commander Jeremiah Denton was captured in North Vietnam and forced to participate in a propaganda television interview. His captors wanted footage of an American officer appearing calm and cooperative.
While answering their questions, Denton blinked the word TORTURE in Morse code. Slowly. Deliberately. Under the lights of a television studio, in front of cameras, surrounded by his captors who had no idea what he was doing.
American naval intelligence analysts watched the footage and decoded it. It was the first direct confirmation from inside North Vietnam that US prisoners were being tortured — intelligence that shaped US policy and international pressure for years.
Denton survived his captivity and was released in 1973. He later became a US Senator from Alabama. He called his blink message the most important thing he did in the war.
3. E Is One Dot By Design — Not by Accident
Alfred Vail did not guess at which letters should get which codes. He counted. He went to a printer's type case — the physical trays of letters used for printing — and counted how many of each letter type existed. More letters meant more demand, which meant more frequency in typical text.
E had the most. So E got the shortest code: one dot. T had the second most: one dash. The full Morse code alphabet reflects this logic throughout — common letters are fast to send, rare ones are slow. The system was engineered for efficiency.
4. You Can Type Morse Code on Your Phone Right Now
Google added Morse code input to Gboard — its default Android keyboard — in 2018. A short tap is a dot. A long press is a dash. It was built specifically for people with motor disabilities who cannot use standard touch input: people with ALS, muscular dystrophy, spinal cord injuries, and other conditions that limit fine motor control.
It works in any app that accepts text. Messages, email, notes, search bars. It requires no special setup beyond enabling it in keyboard settings.
This is not a gimmick or a novelty feature. It is an active accessibility tool. The number of people who use Morse code to communicate in 2026 is larger than most people realise — and a significant portion of them are doing it on phones.
5. Beethoven's Fifth Is V in Morse Code
The famous opening of Beethoven's Fifth Symphony — three short notes and one long — is the exact rhythm of V in Morse code: ···—. This was not an accident as far as the BBC was concerned.
During World War II, the BBC used this rhythm as the opening signature for its overseas broadcasts. V stood for Victory. The Morse rhythm — already associated with resistance — made the signal immediately recognisable to listeners in occupied Europe who knew what it meant, while being difficult for occupiers to object to (it was just a classical music introduction).
Learn V and the letters around it on the Learn page — it is in Lesson 3, introduced alongside other 4-signal letters.
6. The Titanic Operator Kept Sending Until the End
Radio operator Jack Phillips continued transmitting SOS from the Titanic until the power failed — roughly 15 minutes before the ship went under. His colleague Harold Bride survived and testified that Phillips never left his post.
The Carpathia, which rescued 705 survivors, received the distress signal at 12:25 AM and immediately changed course. She arrived at 4:10 AM, 3 hours and 45 minutes after the Titanic sank. Without the Morse code transmission, the Carpathia would not have known to change course. There would have been no survivors.
The Titanic disaster also accelerated the adoption of SOS internationally and led to new requirements for continuous radio watch on passenger ships — regulations that are still in effect today.
7. Aviation Uses Morse Code Every Day in 2026
Every VOR (VHF Omnidirectional Range) and NDB (Non-Directional Beacon) navigation aid broadcasts its 2–3 letter identifier in Morse code continuously — 24 hours a day, 7 days a week. Pilots tune to a frequency and verify they have the correct beacon by decoding the Morse identifier.
This is not a legacy system kept alive for sentimental reasons. It is a functional part of instrument flight navigation. Every pilot training for an instrument rating must be able to decode Morse code from these beacons. There are thousands of active beacons globally, all transmitting Morse right now.
8. Samuel Morse Was a Painter
Before the telegraph, Morse was primarily known as an artist. He co-founded the National Academy of Design in New York in 1826 and served as its first president. He painted portraits of several US presidents and was considered a significant figure in American fine arts.
He had no engineering training. The idea for electrical telegraphy came from a dinner conversation on a ship in 1832. Everything after that required partners — primarily Alfred Vail — who could actually build what Morse imagined. The history of technology is full of visionaries who needed engineers. Morse is one of them.
9. HI HI Means Laughter
In amateur radio Morse code (called CW — Continuous Wave), sending HI HI (···· ·· ···· ··) is the equivalent of LOL. The rapid dot pattern sounds light and playful. The convention dates to the early days of radio when operators needed to convey humour over a medium that carries no vocal tone.
If you make a joke during a radio contact and receive HI HI in reply, it landed. It is one of several traditional CW conventions — alongside 73 (best regards) and 88 (love and kisses) — that form the culture of amateur radio. See the full list on the Abbreviations page.
10. A 13-Year-Old Once Beat a Texting Champion
In 2005, a 13-year-old named Ben Cook challenged a mobile phone texting speed champion on a US television programme. Cook used Morse code on a telegraph key. The champion used a phone with T9 predictive text input.
Cook won. The Morse transmission of the test message was faster than the mobile phone input. The result made international news as a counterintuitive demonstration that an 1840s technology could outperform contemporary consumer electronics at short message transmission. The key was operator skill — a trained Morse operator at speed is faster than most people realise.
Want to build that kind of speed? The Two-Button Practice mode builds sending speed. The timed Quiz builds receive speed. The Game modes make the repetition less tedious.
The Mathematics Behind the Code
Morse code is an early form of variable-length encoding. The principle — assign shorter codes to more frequent characters — was formalised mathematically by Claude Shannon in his 1948 information theory paper, but Vail was doing it intuitively in 1837 when he counted printer's type.
The modern equivalent is Huffman coding, used in JPEG images, MP3 audio, and ZIP files. The algorithm is different, but the logic is identical: characters that appear more often get shorter binary codes. E in Morse is one dot. E in Huffman might be two bits. The 180 years between those two inventions did not change the underlying principle.
This connection between Morse code and digital information theory is one reason computer science educators sometimes use Morse code to teach encoding concepts. It is intuitive and concrete in a way that abstract binary notation often is not.
Morse Code in Film, Television, and Literature
Morse code appears in popular culture more often than most people notice — usually accurately, sometimes not.
In the film Interstellar, Morse code transmitted through gravitational anomalies is central to the plot. In Stranger Things, lights blink in Morse patterns. In the video game Fallout series, radio broadcasts include Morse messages. The opening of Beethoven's Fifth — used as a victory signal during World War II because it is V in Morse — remains one of the most recognised examples of real-world Morse use in popular culture.
In literature, Morse appears in dozens of spy novels and wartime memoirs. The actual historical accounts — Denton blinking TORTURE on Vietnamese television, the Titanic operators transmitting until the power failed — read as dramatic as any fiction. Often more so.
Learning Morse Code Today
The conventional wisdom is that Morse code is hard to learn. That is only true if you learn it the wrong way — by staring at a chart and memorising which dots and dashes correspond to which letters. That approach builds the wrong kind of memory and creates a ceiling around 5–8 words per minute.
Learning by ear is faster. Each letter needs an audio identity — a rhythm — not a visual pattern. E sounds like a single quick tap. O sounds like three long steady tones. Once these become automatic, the code is readable at speed without conscious translation.
The Learn page on this site introduces letters in frequency order with audio flashcards — the same approach recommended by licensed amateur radio training programmes. The Practice mode drills sending and receiving. The Quiz tests speed under slight pressure. Most people can recognise the full alphabet within two to four weeks at 15 minutes of daily practice.