Why F matters
F comes up more often than its rank suggests because of the high-frequency words 'for' and 'from'. Its morse shape — two dots, dash, dot — has a clear rhythm that sticks quickly.
Memorization tip
“did-di-DAH-dit” — two short, one long, one short.
Common English words starting with F
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 F
F comes from the Phoenician waw, originally a hook or peg shape, which the Greeks split into two letters: digamma (which fell out of use) and upsilon (our Y and U). Romans took digamma and made it our F, fixing it to the /f/ sound. English inherited F unchanged from Latin, and despite its modest 2.2% frequency it leads two of the language's most common words ('for' and 'from'), which keeps it cropping up constantly in any real-text drill.
F in CW operating
F has no standalone prosign role but appears in the FB shorthand ('fine business', meaning 'great' or 'wonderful'), one of the most common positive acknowledgements in CW conversation. Hearing 'FB OM' ('fine business, old man') from another operator means they enjoyed your transmission. F is also the first letter of FCC, the US licensing authority, which shows up in nearly every American ham QSO.
What position 20 means in practice
F at position 20 with 2.2% frequency means about one F every forty-five characters in running English — sparse enough to be deferred but boosted in practice by the dominance of 'for' and 'from'. In CW operating, F appears in the FB ('fine business') courtesy phrase that closes most QSOs warmly, and in the international country prefix F (France), so DX listeners learn to recognize F-callsigns instinctively. The combination of literary frequency and operational frequency makes F a higher-priority Koch letter than its position-20 ranking would suggest in pure-text drill.
How to drill it
F (di-di-dah-dit) is most often confused with L (di-dah-di-dit) — the dash sits in different positions. Drill them as an explicit pair: F has the dash third, L has it second. The mnemonic 'FOR-the-FIRST-time' captures F's rhythm: two short syllables, one stressed, one short.
Most-confused with: L, P, R — drill them together.
Sample copy: “Five fast foxes find fresh fruit.”
Frequently asked questions
What is the letter F in morse code?
The letter F in international morse code is "..-." — 4 symbols.
How do I remember the morse code for F?
"did-di-DAH-dit" — two short, one long, one short.
How common is the letter F in English?
F is position 20 in English frequency, appearing in about 2.2% of running text.