Last updated: May 2026
The letter J in Morse code is · — — — — one dot followed by three dashes. It is one of the longest single-letter codes in the entire Morse alphabet, sharing a 4-signal length with C, F, H, L, P, Q, V, X, Y, and Z.
Here is what J looks like as physical signal blocks — short dot followed by three long dashes:
Memory trick: J looks like a hook — one short flick then three long strokes. Think of drawing the letter J: you make a short mark then pull down three long curves. One dot, three dashes.
In Samuel Morse's original 1837 code, letters were assigned shorter codes based on how often they appear in English text. J is one of the rarest letters in English — appearing in less than 0.15% of text — so it received one of the longer, more complex codes. The most common letters got the simplest codes: E = · and T = —.
Several letters share the 4-signal pattern with J. Click any card to hear it:
In the NATO phonetic alphabet used by aviation and military, J is represented by the word "Juliet". When spelling out a callsign or code letter by letter on radio, operators say "Juliet" to make J unmistakeable — especially important when distinguishing it from G or other letters that sound similar in noisy conditions.
Tap short then long then long then long — .--- (· — — —). The gap between signals within one letter is one dot length. The gap before the next letter is three dot lengths.
In the Two-Button Tap mode, press left then right then right then right for J. The input checks automatically when your tap count matches the code.
J is the twenty-third most common letter in English. Morse code gave shorter codes to more frequent letters. J received a 4-signal code based on its frequency in everyday text.
Start with the Learn page — J appears in a structured audio flashcard lesson. Then use practice mode for random drills. The timed quiz adds pressure that builds real recognition speed.