Why X matters
X is the least common letter in English, appearing in only about 0.2% of running text. Its morse is the reverse of P — X is dash-dot-dot-dash, P is dot-dash-dash-dot. Both have pleasing symmetry around their middle two symbols.
Memorization tip
“DAH-di-di-DAH” — long, two short, long. Symmetrical.
Common English words starting with X
Where this letter appears in the ITU alphabet
The full A–Z chart shows every letter side-by-side so you can see the pattern of dots and dashes. For just the numbers, see morse code numbers 0–9. For a printable version, the chart page combines letters, digits, and punctuation in one layout.
The history of X
X has a tangled history. The Phoenicians had a letter samekh that the Greeks took as xi, but Roman X actually descends from a different Greek letter, chi. The Greeks themselves disagreed across regions about which symbol stood for which sound. Romans settled it as a /ks/ sound, and English inherited that usage. X is the rarest letter in English by a wide margin — about 0.15% of running text — and most X-words are technical or Greek-derived (X-ray, xylophone, xenon).
X in CW operating
X is too rare in English to have any standalone prosign meaning, but it features in XYL — the friendly CW abbreviation for 'wife' (literally 'ex-young-lady', a reformulation of YL meaning 'young lady', the term used for any female operator). Hearing 'XYL is QRV' on a casual QSO means 'my wife is also on the air'. X also appears in 'XMTR' (transmitter) and 'XCVR' (transceiver) in equipment talk.
What position 26 means in practice
X at position 26 with 0.2% frequency means about one X every five hundred characters of running English — the rarest letter in the alphabet by literary frequency. You can copy paragraph after paragraph without seeing a single X, and most X-words that exist are technical Greek-derived terms (xylophone, xenon, X-ray) that only appear in specialized writing. In CW, X has the XYL ('wife') affectionate abbreviation and appears in some military and equipment shorthand (XMTR for transmitter), but it can be safely deferred until very late in a Koch sequence without meaningful penalty to overall copy speed.
How to drill it
X (dah-di-di-dah) is symmetrical around its middle two dots and the exact reverse of P (di-dah-dah-dit). Pair-drill X and P for reversal practice. The other risk is confusion with B (dah-di-di-dit, four elements with a leading dash) and D (dah-di-dit, three elements). Wait for the trailing dash to confirm X.
Most-confused with: P, B, K — drill them together.
Sample copy: “Xenia exited extra exam exercises.”
Frequently asked questions
What is the letter X in morse code?
The letter X in international morse code is "-..-" — 4 symbols.
How do I remember the morse code for X?
"DAH-di-di-DAH" — long, two short, long. Symmetrical.
How common is the letter X in English?
X is position 26 in English frequency, appearing in about 0.2% of running text.