NATO Phonetic Alphabet

What is the NATO phonetic alphabet?

The NATO phonetic alphabet — formally the International Radiotelephony Spelling Alphabet — assigns a distinct code word to each Latin letter so that critical characters can be spoken clearly over radio or telephone. Saying “Bravo” instead of “B” eliminates the ambiguity between letters that sound alike (B, D, P, T, V) when the signal is noisy.

It was adopted by the International Civil Aviation Organization (ICAO) in 1956 and quickly became the standard for NATO, maritime communication (IMO), aviation, amateur radio, emergency services, and customer-support call centers worldwide. The same words are used in every member country regardless of native language.

Full reference table

The 26 letters of the ICAO/NATO alphabet, with the official English pronunciation. Stressed syllables are shown in capitals. Note the unusual spellings of Alfa and Juliett — they are intentional, so non-English speakers do not mispronounce them.

Digit pronunciation (ICAO)

Aviation and military radio use modified pronunciations for digits so they cannot be confused with similar-sounding words. The most distinctive are “tree” for 3, “fife” for 5, and “niner” for 9 — the latter avoids confusion with the German “nein”.

Common uses

• Aviation: Pilots and air-traffic controllers spell out callsigns, runway designators, and squawk codes (“Cleared to land runway two-seven, contact tower on one-two-one-decimal-niner”).
• Military & emergency services: Used on tactical radio for grid references, unit IDs, and spelling names — accuracy is mission-critical.
• Maritime: Required by the IMO Standard Marine Communication Phrases for vessel names, MMSI numbers, and distress traffic.
• Customer support & banking: Agents read order numbers, reference codes, and serial numbers over the phone without ambiguity.
• Amateur radio: HF and VHF operators rely on it for callsigns and contest exchanges in poor conditions.

How it differs from older alphabets

Earlier spelling alphabets were tied to specific languages or militaries. The 1956 ICAO version was selected after years of intelligibility testing so its 26 words remain distinct across English, French, Spanish, Portuguese, and other major aviation languages.

Tip — Quick mnemonic for daily use

When spelling a name over the phone, lead with “Spelling phonetically” so the listener switches mode. Then chunk the word into 3–4 letter groups and pause between groups, e.g. “Smith — Sierra, Mike, India / Tango, Hotel.” That cadence is far easier to copy than a continuous stream of code words.