P in Morse Code (.--.): Sound, Timing and How to Send It

What is P in Morse code?

P in Morse code is .--. : a dot, a dash, a second dash and a dot, each separated by a one-unit silence. Morse has no capital letters, so lowercase "p" and capital "P" are sent with the same pattern, the one set out for International Morse Code in ITU-R M.1677-1.

Printed charts draw the same letter with different marks: the RSGB training sheet shows ● ▬ ▬ ●, a keyboard gives .--. and typeset pages often use · − − ·. The symbols change from chart to chart; the sound does not.

How to send P in Morse code

To send P, give one short signal, two long signals of equal length and one more short signal, then stay silent for three units. The closing dot carries the letter: leave it off and the receiver writes W.

1. By sound: on a key, a buzzer or your own voice, give "di-dah-dah-dit." Hold each dah for three beats and cut both dits off at one.
2. By light: a short blink, two long blinks and a short blink, with the lamp dark for one beat between them and for three beats after the letter.
3. By tap: on a phone screen or the Morse code tapper, touch briefly for each dot and hold for each dash. On a table, a quick knock is the dot and a knock pressed and held is the dash.
4. In writing: put the four marks together as .--., leave a space before the next letter and use a slash between words. HELP becomes .... . .-.. .--., which ends on the letter P.

Whichever way you send it, the P Morse code pattern stays fixed inside a word; only the silence around it changes.

Morse code for P timing at different speeds

P lasts 11 units: two 1-unit dots, two 3-unit dashes and three 1-unit gaps inside the letter. Speed is counted in words per minute against PARIS, a 50-unit reference word that happens to begin with P, so one unit lasts 1200 ÷ WPM milliseconds.

Among the four-signal letters, P is in the middle: H (....) takes 7 units and F or L take 9, while P matches C, X and Z at 11, and J, Q and Y run to 13. At 20 WPM the whole of P is over in two-thirds of a second, so the ear has to catch it as one shape rather than four parts.

The 3-unit gap after P counts as well. Shorten it before an N and .--. -. runs together into .--.-., the @ sign.

How to remember P (.--.)

The quickest route to P is the dot-first ladder. E is a single dot, A adds a dash (.-), W adds a second dash (.--), and P is W with one more dot on the end. If you already know W, you only have to learn the final dit.

The player's word cue is "a-PAIR-PAIR-up": two light syllables wrapped around two heavy ones, the same rhythm as di-dah-dah-dit. Say it aloud while you tap the pattern on a desk, then press Play and match your taps to the tone.

The shape helps too, because P opens and closes the same way. Once you hear a dit, two long tones and another dit, there is nothing else to wait for. Treat the cue as a starting aid: past about 10 WPM, a listener still counting signals falls behind, and the goal is to recognize short-long-long-short as one sound.

Why P reads the same backward

P is a palindrome in Morse code: reverse .--. and you get .--. again. Among letters that mix dots and dashes, only four do this, namely K (-.-), P (.--.), R (.-.) and X (-..-); letters built from a single kind of signal, such as E, S, H, T, M and O, are palindromes by default.

That symmetry has a practical side. On a ring, a bracelet or a Morse code tattoo that someone might read from the wrong end, P stays P. F does not: read ..-. backward and it becomes .-.., the letter L. Whole words work the same way, since POP (.--. --- .--.), PEP (.--. . .--.) and PIP (.--. .. .--.) give the identical signal string in both directions; the bracelet designer shows how each one lays out in beads.

P has an opposite partner as well. Swap every dot for a dash and every dash for a dot, and .--. turns into -..-, which is X, the other four-signal palindrome.

Letters and symbols confused with P

The closest look-alike is W (.--), which is P with its final dot missing. At speed, F and L are the next traps, because each one is P with a single dash shortened to a dot.

Gaps cause a second family of errors. A pause inside the letter splits P into two characters: after the first dash it is heard as A followed by N (.- -.), after the second dash as W followed by E (.-- .), and after the opening dot as E followed by G (. --.).

Drill P against W first, since one dropped dot is all that separates them. Then take F and L, whose dot sits where P has a dash, and finish with J and R.

Common mistakes when sending P

• Clipping the last dot. Releasing the key early after the second dash sends W. Finish the letter before you relax.
• A short first dash. If the first dash shrinks toward a dot, the pattern becomes ..-. and the receiver writes F.
• A short second dash. The same fault on the second dash gives .-.., which is L.
• A long final dot. Let the closing dit drag and P turns into J (.---).
• A pause inside the letter. Any extra silence between the four signals breaks P into two letters, most often AN or WE.
• Counting signals. Saying "dot, dash, dash, dot" in your head works at 5 WPM and fails at 15. Listen for the symmetric shape instead.

P on the air: PSE, PWR and the P call-sign prefixes

In amateur radio P turns up in a few standard CW abbreviations. They are sent as ordinary letters with normal gaps, not as joined prosigns.

The full list of abbreviations, Q-codes and prosigns, each with audio, is on the Morse code abbreviations page.

P also opens call signs. Under the ITU prefix allocation, the PA to PI block belongs to the Netherlands, PK to PO to Indonesia, PP to PY to Brazil and PZ to Suriname, so a CW station calling with PY or PA is outside the United States, whose call signs use blocks such as K and W. On voice radio the letter itself is spoken as "Papa."

The same pattern sits inside the newest Morse symbol. The ITU added @ as .--.-. in its May 2004 Morse specification, formed from A and C run together; heard on the air, it begins exactly like P.

P in American Morse: five dots, and .--. means 1

International P is .--., but the American Morse code once used on US landline and railroad telegraphs sent P as five dots (.....). In that older code, .--. was the numeral 1, so a historical American telegraph record showing .--. means a digit, not the letter P.

Neither code gave P a short pattern. In a common English letter-frequency table, P makes up about 1.9% of letters, against 12.7% for E and 9.1% for T. The busiest letters received one or two signals, while P, used far less often, could carry four without slowing a message down.

Words that start with P

Words show the gap that follows P, because the closing dot runs straight into the next letter. Spaces in the table mark the 3-unit letter gap.

PARIS is worth drilling first, since it is the word every WPM speed is measured against. PLEASE puts P right beside L, so you hear .--. and .-.. back to back, and HAPPY sends two Ps in a row, which only works if the letter gap between them is held. Hear HAPPY on its own on the Happy in Morse code page, and P inside longer words on the Happy birthday in Morse code and Help in Morse code pages.

Type any other word into the Morse code translator to hear it at your own speed.

Practice P on Morse Beacon

The quickest way to check your own P is to send it and let a decoder read it back. Key or buzz the letter (or play it from the tapper) into the audio decoder: if it returns W, your last dot is too short, and if it returns L or F, one of your dashes is. The practice set for P then tests the letter by ear once the word cue is gone.

Use Slow mode at 8 WPM to hear where each dash ends, and the 14 WPM default to get closer to a real contact. To send P by lamp, open it in the Morse code light tool. Work the neighbors as well: O (---) and Q (--.-) sit on either side of P, and the Morse code alphabet chart lines P up against W, F, L and J in one view.