What Is U in Morse Code?
The Morse code for U is ..-, a sequence of 2 dots and 1 dash. In international Morse code (the ITU standard), each letter has a unique combination of dots (·) and dashes (−). U is the reverse of D (-..).
When you hear or read “morse code u”, “morse code for u”, “u morse code”, or “letter u in morse code”, the answer is always the same 3-signal pattern: ..-.
NATO Phonetic Word for U
In the NATO phonetic alphabet, the letter U is spoken as Uniform. This pairing — Morse code ..- with the spoken word Uniform — is used by aviation, military, and amateur radio operators worldwide for unmistakable communication.
History of the Letter U in Morse Code
The letter U in Morse code is ..- — two dots followed by one dash. This three-signal pattern was assigned to U by Samuel Morse and Alfred Vail in the 1840s based on letter frequency analysis. U appears in roughly 2.8% of English text — common enough to earn a short three-signal code, but less frequent than the top-tier letters like E, T, A, and O that received one or two signals.
The pattern ..- has a distinctive upward-rising quality to it — two short taps building up to a long closing tone. Experienced operators often describe U as sounding like a question building to a conclusion. This rising rhythm makes it one of the more pleasant letters to send, and its three-signal length means it transmits quickly even at modest speeds.
When the ITU standardised Morse code in 1865, U's pattern ..- was confirmed and has remained unchanged ever since. It shares a structural relationship with D (-..), which uses the same signals in reverse order — a mirror pair that skilled operators use as a memory anchor for learning both letters simultaneously. The two-dot opening of U is its most recognisable feature at speed, making it relatively easy to identify by ear.
Real-World Uses of U in Morse Code
The letter U appears across amateur radio abbreviations, call signs, and Q-codes. Here are the most common real-world contexts where ..- is transmitted:
- Call signs: Many call signs contain U — e.g. UA3ABC (Russia), VU2XYZ (India), W1AU — making ..- a regular presence on every major amateur band worldwide
- CU / CUL abbreviations: "CU" (see you) and "CUL" (see you later) are among the most common CW sign-off phrases — both begin with ..-
- UR / UR abbreviation: "UR" (your) is used constantly in signal reports — "UR RST 599" means "your signal report is 599" — making ..- one of the first abbreviations new operators learn
- QRU: The Q-code QRU (..- in the U position) means "I have nothing for you" — sent when a station has no traffic to pass
- Country prefixes: UA (Russia), UN (Kazakhstan), UR (Ukraine) all begin with U — operators from these large countries transmit ..- at the start of every call sign exchange
- TNX / TU: "TU" (thank you) ends every contact — the U in TU means ..- is part of the most common two-letter closing in all of CW operating
The abbreviation TU (- ..-) meaning "thank you" is sent at the end of every single amateur radio contact on CW. Because every QSO closes with TU, the pattern ..- is one of the last things transmitted in every conversation — giving U an important place at the very end of the communication cycle, mirroring the way DE places D at the start.
Complete Morse Code Alphabet Chart (A–Z)
Morse letters use one to four signals. U (..-) is a three-signal letter — two dots and one dash — placing it in the mid-length group alongside D, G, K, N, R, S, and W. See the full alphabet and where U sits:
| Letter | Morse Code | Letter | Morse Code |
|---|---|---|---|
| A | .- | N | -. |
| B | -... | O | --- |
| C | -.-. | P | .--. |
| D | -.. | Q | --.- |
| E | . | R | .-. |
| F | ..-. | S | ... |
| G | --. | T | - |
| H | .... | U | ..- |
| I | .. | V | ...- |
| J | .--- | W | .-- |
| K | -.- | X | -..- |
| L | .-.. | Y | -.-- |
| M | -- | Z | --.. |
U (..-) and D (-..) are mirror images — U starts with two dots and ends with a dash, while D starts with a dash and ends with two dots. Both are three-signal patterns. Drilling them as a contrasting pair is one of the most efficient strategies for locking in both letters quickly, since the position of the dash is the only distinction between them.
Practice Words Containing the Letter U
Build fluency with ..- by drilling it inside the real phrases you will use every time you operate on CW. Start with TU and UR — two of the most sent abbreviations in amateur radio:
| Word / Phrase | Morse Code |
|---|---|
| U | ..- |
| TU (thank you) | - ..- |
| UR (your) | ..- .-. |
| CUL (see you later) | -.-. ..- .-.. |
| UR RST 599 | ..- .-. .-. ... - ..... ----. ----. |
| UA3ABC (call sign) | ..- .- ...-- .- -... -.-. |
| QRU (nothing for you) | --.- .-. ..- |
Make TU (- ..-) your first two-character drill for U. Because TU closes every contact you ever make, drilling it from day one means you practise U constantly in its most natural context. After a few weeks of operating, - ..- will be as automatic as signing your own name.
Tips for Memorising the Letter U in Morse Code
Two dots then one dash — U has a rising, upward-building feel. Here are four techniques to make ..- permanent:
- Sound word association: Chant "dit-dit-daaah" and think "U goes UP." The two quick dots rise into the long closing dash, mimicking an upward motion. Once you link the rising rhythm of ..- to the letter U, the association sticks naturally.
- Pair it with D: U (..-) and D (-..) are mirror images — same signals, opposite order. Drill ..- -.. ..- -.. in a loop. The contrast between dot-leading and dash-leading trains your ear to hear the position of the single dash, which is the only distinction between the two letters.
- Use TU as your anchor: TU (- ..-) is sent at the end of every CW contact. Because it is the most common two-letter closing in amateur radio, drilling TU gives you U in its highest-frequency real-world context immediately. Muscle memory builds fast when every practice session ends with TU.
- Farnsworth method: Play ..- at full target speed using the audio player above. The two-dot opening followed by the closing dash is very recognisable at speed — the brief pause after the second dot before the long tone is U's acoustic signature. Internalise that sound at full speed from the beginning rather than building up slowly from a crawl.
Practice: What Is the Morse Code for U?
Select the correct Morse code for U:
How to Tap Letter U in Morse Code
To transmit Letter U (..-), 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 U in Morse Code
U for "you-are-UP" — di-di-DAH.
NATO phonetic word: Uniform — pair the spoken word with the rhythm to remember faster.
Frequently Asked Questions — Letter U in Morse Code
U in Morse code is ..-. The letter U uses 2 dots and 1 dash, the standard ITU pattern.
The Morse code for U is ..-. Tap the 3 signals in sequence with a one-unit gap between each.
To send letter U: short press, then short press, then long press. The NATO phonetic name for U is Uniform.
..- means the letter U in international Morse code (the ITU standard used worldwide for amateur radio and communication).
The NATO phonetic alphabet word for U is Uniform. It pairs with the Morse code ..- for clear voice and signal communication.
Related Morse Code Letters
Other letters often learned alongside U: