The NATO Alphabet

All 26 code words with their official pronunciation, and, since you are here, what each letter is in Morse code alongside.

Where it came from

The list is the International Civil Aviation Organization's, adopted in 1956 after several years of testing across speakers of English, French and Spanish, and taken up by NATO and the maritime services soon after. It replaced the wartime Able, Baker, Charlie list, which worked well for American and British speakers and badly for everyone else. The test was not whether a word was memorable in English but whether it survived a bad channel in a mouth that had never spoken English, so several of the words are unfamiliar and a few are spelled strangely.

Two words were later replaced after complaints from operators: Extra and Nectar went, Xray and November came in. The rest has been stable for seventy years, which for a list of twenty-six arbitrary words used by millions of people daily is a remarkable thing, and an argument for not tinkering with it.

Digits, too

The numbers have their own pronunciations, for the same reason: three becomes "tree", five "fife", nine "niner", because three and free, five and nine, and nine and five are the pairs that get confused on a radio. You will hear "niner" from any pilot; it is not an affectation, it is the standard.

Using it

Spell the thing, one word per letter, at a steady pace, and do not add anything. A booking reference of KJ7 is "Kilo Juliett seven", not "K for Kilo". The receiver is listening for the first syllable of each word, and extra words are extra syllables to mishear. If you have to spell a word with a repeated letter, say the word twice: "Lima Lima" for LL.

The mistakes to avoid

Spelling Alfa as Alpha and Juliett with one T, which are the two most common and both exist to be wrong: the odd spellings are there for readers whose languages would mispronounce the correct ones. Saying "A for Alfa", which doubles every letter's airtime. Improvising a word when you forget one: Apple is not Alfa, and a receiver trained on the list will hesitate on it, the very delay the list exists to remove. And putting the stress on the wrong syllable, the subject of the next section.

Stressed syllables are part of the spec

The capitalised syllable above is where the emphasis goes, and it is specified for the same reason the spellings are: a code word said with the wrong stress is a code word someone can mishear. PAH-pah and pah-PAH are different words to a tired listener on a noisy channel.

Frequently asked

Is the NATO alphabet the same as Morse code?

No. They solve the same problem, making a letter survive a bad channel, in opposite ways. Morse encodes letters as long and short signals for a channel that carries no voice at all. The NATO alphabet replaces each letter with a whole word for a channel that carries voice badly, where "B" and "D" sound identical but "Bravo" and "Delta" never do.

Why are Alfa and Juliett spelled wrong?

Deliberately. The list is used by speakers of many languages, and "Alpha" invites a /p/ from anyone whose language does not have "ph" as /f/. "Juliett" carries a double T so French speakers do not drop it. The misspellings are the specification, not typos.

Who actually uses it?

Aviation and maritime radio, the military, and emergency services, anywhere a misheard letter is expensive. It is also the fastest way to read a booking reference down a bad phone line, which is where most people meet it.

See the full Morse code alphabet →