NATO phonetic alphabet

After the code words were developed by ICAO (see history below), they were adopted by other national and international organizations, including the ITU, the International Maritime Organization (IMO), the United States Federal Government as Federal Standard 1037C: Glossary of Telecommunications Terms[4] and its successors ANSI T1.523-2001[5] and ATIS Telecom Glossary (ATIS-0100523.2019)[6] (all three using the spellings "Alpha" and "Juliet"), the United States Department of Defense,[7] the Federal Aviation Administration (FAA) (using the spelling "Xray"), the International Amateur Radio Union (IARU), the American Radio Relay League (ARRL), the Association of Public-Safety Communications Officials-International (APCO), and by many military organizations such as NATO (using the spelling "Xray") and the now-defunct Southeast Asia Treaty Organization (SEATO).

The same alphabetic code words are used by all agencies, but each agency chooses one of two different sets of numeric code words. NATO uses the regular English numeric words (zero, one, two &c., though with some differences in pronunciation), whereas the ITU (beginning on 1 April 1969)[8] and the IMO define compound numeric words (nadazero, unaone, bissotwo &c.). In practice these are used very rarely, as they are not held in common between agencies.

A spelling alphabet is used to spell parts of a message containing letters and numbers to avoid confusion, because many letters sound similar, for instance "n" and "m" or "f" and "s"; the potential for confusion increases if static or other interference is present. For instance the message "proceed to map grid DH98" could be transmitted as "proceed to map grid Delta-Hotel-Niner-Ait". Using "Delta" instead of "D" avoids confusion between "DH98" and "BH98" or "TH98". The unusual pronunciation of certain numbers was designed to reduce confusion as well.

In addition to the traditional military usage, civilian industry uses the alphabet to avoid similar problems in the transmission of messages by telephone systems. For example, it is often used in the retail industry where customer or site details are spoken by telephone (to authorize a credit agreement or confirm stock codes), although ad-hoc coding is often used in that instance. It has been used often by information technology workers to communicate serial or reference codes (which are often very long) or other specialised information by voice. Most major airlines use the alphabet to communicate passenger name records (PNRs) internally, and in some cases, with customers. It is often used in a medical context as well, to avoid confusion when transmitting information.

Several letter codes and abbreviations using the spelling alphabet have become well-known, such as Bravo Zulu (letter code BZ) for "well done",[9] Checkpoint Charlie (Checkpoint C) in Berlin, and Zulu Time for Greenwich Mean Time or Coordinated Universal Time. During the Vietnam War, the U.S. government referred to the Viet Cong guerrillas and the group itself as VC, or Victor Charlie; the name "Charlie" became synonymous with this force.

The final choice of code words for the letters of the alphabet and for the digits was made after hundreds of thousands of comprehension tests involving 31 nationalities. The qualifying feature was the likelihood of a code word being understood in the context of others. For example, Football has a higher chance of being understood than Foxtrot in isolation, but Foxtrot is superior in extended communication.[10]

To eliminate wide variations in pronunciation, posters illustrating the pronunciation desired by ICAO are available.[11] However, there are still apparent differences in pronunciation between ICAO and other agencies, and ICAO has conflicting Latin-alphabet and IPA transcriptions.

Pronunciations are somewhat uncertain because the agencies, while ostensibly using the same pronunciations, give different transcriptions, which are often inconsistent from letter to letter. ICAO gives a different pronunciation for IPA transcription and for respelling. The ATIS gives English spellings, but does not give pronunciations or numbers. ICAO, NATO, and FAA use modifications of English numerals, with stress on one syllable, while the ITU and IMO compound pseudo-Latinate numerals with a slightly different set of modified English numerals, and with stress on each syllable. Numbers 10–99 are spelled out (that is, 17 is spoken "one seven" and 60 is spoken "six zero"), while for hundreds and thousands the English words hundred and thousand are used.[6][12][13][14][15][16]

The pronunciation of the digits 3, 4, 5, and 9 differs from standard English – being pronounced tree, fower, fife, and niner. The digit 3 is specified as tree so that it is not pronounced sri; the long pronunciation of 4 (still found in some English dialects) keeps it somewhat distinct from for; 5 is pronounced with a second "f" because the normal pronunciation with a "v" is easily confused with "fire" (a command to shoot); and 9 has an extra syllable to keep it distinct from German nein 'no'.[17]

Only ICAO prescribes pronunciation with the IPA, and then only for letters.[11] Both the IPA and respelled pronunciations were developed by ICAO before 1956 with advice from the governments of both the United States and United Kingdom.[18] The ICAO lists both its "International Phonetic Convention" pronunciations and its "Latin alphabet representation" pronunciations under the heading "Approximate pronunciation" and notes: "The pronunciation of the words in the alphabet as well as numbers may vary according to the language habits of the speakers. In order to eliminate wide variations in pronunciation, posters illustrating the desired pronunciation are available from ICAO."[11]

In addition, the ITU and IMO specify a different set of numeral words than does ICAO. The ITU/IMO words are compounds combining the English numeral with either a Spanish or Latin prefix.[19] However, as of 2002, the IMO's GMDSS procedures permit the use of the ICAO numeral pronunciation.[19]

Prior to World War I and the development and widespread adoption of two-way radio that supported voice, telephone spelling alphabets were developed to improve communication on low-quality and long-distance telephone circuits.

The first non-military internationally recognized spelling alphabet was adopted by the CCIR (predecessor of the ITU) during 1927. The experience gained with that alphabet resulted in several changes being made during 1932 by the ITU. The resulting alphabet was adopted by the International Commission for Air Navigation, the predecessor of the ICAO, and was used for civil aviation until World War II.[18] It continued to be used by the IMO until 1965.

Throughout World War II, many nations used their own versions of a spelling alphabet. The U.S. adopted the Joint Army/Navy radiotelephony alphabet during 1941 to standardize systems among all branches of its armed forces. The U.S. alphabet became known as Able Baker after the words for A and B. The Royal Air Force adopted one similar to the United States one during World War II as well. Other British forces adopted the RAF radio alphabet, which is similar to the phonetic alphabet used by the Royal Navy during World War I. At least two of the terms are sometimes still used by UK civilians to spell words over the phone, namely F for Freddie and S for Sugar.

To enable the U.S., UK, and Australian armed forces to communicate during joint operations, in 1943 the CCB (Combined Communications Board; the combination of US and UK upper military commands) modified the U.S. military's Joint Army/Navy alphabet for use by all three nations, with the result being called the US-UK spelling alphabet. It was defined in one or more of CCBP-1: Combined Amphibious Communications Instructions, CCBP3: Combined Radiotelephone (R/T) Procedure, and CCBP-7: Combined Communication Instructions. The CCB alphabet itself was based on the U.S. Joint Army/Navy spelling alphabet. The CCBP (Combined Communications Board Publications) documents contain material formerly published in U.S. Army Field Manuals in the 24-series. Several of these documents had revisions, and were renamed. For instance, CCBP3-2 was the second edition of CCBP3.

During World War II, the U.S. military conducted significant research into spelling alphabets. Major F. D. Handy, directorate of Communications in the Army Air Force (and a member of the working committee of the Combined Communications Board), enlisted the help of Harvard University's Psycho-Acoustic Laboratory, asking them to determine the most successful word for each letter when using "military interphones in the intense noise encountered in modern warfare.". He included lists from the US, Royal Air Force, Royal Navy, British Army, AT&T, Western Union, RCA Communications, and that of the International Telecommunications Convention. According to a report on the subject:

The results showed that many of the words in the military lists had a low level of intelligibility, but that most of the deficiencies could be remedied by the judicious selection of words from the commercial codes and those tested by the laboratory. In a few instances where none of the 250 words could be regarded as especially satisfactory, it was believed possible to discover suitable replacements. Other words were tested and the most intelligible ones were compared with the more desirable lists. A final NDRC list was assembled and recommended to the CCB.[32]

After World War II, with many aircraft and ground personnel from the allied armed forces, "Able Baker" was officially adopted for use in international aviation. During the 1946 Second Session of the ICAO Communications Division, the organization adopted the so-called "Able Baker" alphabet[10] that was the 1943 US–UK spelling alphabet. However, many sounds were unique to English, so an alternative "Ana Brazil" alphabet was used in Latin America. In spite of this, International Air Transport Association (IATA), recognizing the need for a single universal alphabet, presented a draft alphabet to the ICAO during 1947 that had sounds common to English, French, Spanish and Portuguese.

From 1948 to 1949, Jean-Paul Vinay, a professor of linguistics at the Université de Montréal worked closely with the ICAO to research and develop a new spelling alphabet.[33][10] The directions of ICAO were that "To be considered, a word must:

1. Be a live word in each of the three working languages.
2. Be easily pronounced and recognized by airmen of all languages.
3. Have good radio transmission and readability characteristics.
4. Have a similar spelling in at least English, French, and Spanish, and the initial letter must be the letter the word identifies.
5. Be free from any association with objectionable meanings."[32]

After further study and modification by each approving body, the revised alphabet was adopted on 1 November 1951, to become effective on 1 April 1952 for civil aviation (but it may not have been adopted by any military).[18]

Problems were soon found with this list. Some users believed that they were so severe that they reverted to the old "Able Baker" alphabet. Confusion among words like Delta and Extra, and between Nectar and Victor, or the poor intelligibility of other words during poor receiving conditions were the main problems. Later in 1952, ICAO decided to revisit the alphabet and their research. To identify the deficiencies of the new alphabet, testing was conducted among speakers from 31 nations, principally by the governments of the United Kingdom and the United States. In the United States, the research was conducted by the USAF-directed Operational Applications Laboratory (AFCRC, ARDC), to monitor a project with the Research Foundation of Ohio State University. Among the more interesting of the research findings was that "higher noise levels do not create confusion, but do intensify those confusions already inherent between the words in question".[32]

By early 1956 the ICAO was nearly complete with this research, and published the new official phonetic alphabet in order to account for discrepancies that might arise in communications as a result of multiple alphabet naming systems coexisting in different places and organizations. NATO was in the process of adopting the ICAO spelling alphabet, and apparently felt enough urgency that it adopted the proposed new alphabet with changes based on NATO's own research, to become effective on 1 January 1956,[34] but quickly issued a new directive on 1 March 1956[35] adopting the now official ICAO spelling alphabet, which had changed by one word (November) from NATO's earlier request to ICAO to modify a few words based on U.S. Air Force research.

After all of the above study, only the five words representing the letters C, M, N, U, and X were replaced. The ICAO sent a recording of the new Radiotelephony Spelling Alphabet to all member states in November 1955.[10] The final version given in the table above was implemented by the ICAO on 1 March 1956,[18] and the ITU adopted it no later than 1959 when they mandated its usage via their official publication, Radio Regulations.[36] Because the ITU governs all international radio communications, it was also adopted by most radio operators, whether military, civilian, or amateur. It was finally adopted by the IMO in 1965.

During 1947 the ITU adopted the compound Latinate prefix-number words (Nadazero, Unaone, etc.), later adopted by the IMO during 1965.

• Nadazero - from Spanish or Portuguese nada + NATO/ICAO zero
• Unaone - generic Romance una, from Latin ūna + NATO/ICAO one
• Bissotwo - from Latin bis + NATO/ICAO two. (1959 ITU proposals bis and too)[37]
• Terrathree - from Italian terzo + NATO/ICAO three ("tree") (1959 ITU proposals ter and tree)
• Kartefour - from French quatre (Latin quartus) + NATO/ICAO four ("fow-er") (1959 ITU proposals quarto and fow-er)
• Pantafive - from French penta- + NATO/ICAO five ("fife") (From 1959 ITU proposals penta and fife)
• Soxisix - from French soix + NATO/ICAO six (1959 ITU proposals were saxo and six)
• Setteseven - from Italian sette + NATO/ICAO seven (1959 ITU proposals sette and sev-en)
• Oktoeight - generic Romance octo-, from Latin octō + NATO/ICAO eight (1959 ITU proposals octo and ait)
• Novenine - from Italian nove + NATO/ICAO nine ("niner") (1959 ITU proposals were nona and niner)

In the official version of the alphabet,[2] two spellings deviate from the English norm: Alfa and Juliett. Alfa is spelled with an f as it is in most European languages because the spelling Alpha may not be pronounced properly by native speakers of some languages – who may not know that ph should be pronounced as f. The spelling Juliett is used rather than Juliet for the benefit of French speakers, because they may otherwise treat a single final t as silent. For similar reasons, Charlie and Uniform have alternative pronunciations where the ch is pronounced "sh" and the u is pronounced "oo". Early on, the NATO alliance changed X-ray to Xray in its version of the alphabet to ensure that it would be pronounced as one word rather than as two,[38] while the global organization ICAO keeps the spelling X-ray.

The alphabet is defined by various international conventions on radio, including:

• Universal Electrical Communications Union (UECU), Washington, D.C., December 1920[39]
• International Radiotelegraph Convention, Washington, 1927 (which created the CCIR)[40]
• General Radiocommunication and Additional Regulations (Madrid, 1932)[41]
• Instructions for the International Telephone Service, 1932 (ITU-T E.141; withdrawn in 1993)
• General Radiocommunication Regulations and Additional Radiocommunication Regulations (Cairo, 1938)[42]
• Radio Regulations and Additional Radio Regulations (Atlantic City, 1947),[43] where "it was decided that the International Civil Aviation Organization and other international aeronautical organizations would assume the responsibility for procedures and regulations related to aeronautical communication. However, ITU would continue to maintain general procedures regarding distress signals."
• 1959 Administrative Radio Conference (Geneva, 1959)[44]
• International Telecommunication Union, Radio
• Final Acts of WARC-79 (Geneva, 1979).[45] Here the alphabet was formally named "Phonetic Alphabet and Figure Code".
• International Code of Signals for Visual, Sound, and Radio Communications, United States Edition, 1969 (revised 2003)[46]

Since 'Nectar' was changed to 'November' in 1956, the code has been mostly stable. However, there is occasional regional substitution of a few code words, such as replacing them with earlier variants, because of local taboos or confusing them with local terminology.

• As of 2013, it was reported that "Delta" was often replaced by "David" or "Dixie" at Atlanta International Airport, where Delta Air Lines is based, because "Delta" is also the airline's callsign.[59] Air traffic control once referred to Taxiway D at the same airport as "Taxiway Dixie", though this practice was officially discontinued in 2020.[60][61]

• International Code of Signals
• Spelling alphabet
• Allied military phonetic spelling alphabets
• APCO radiotelephony spelling alphabet (used by some US police departments)
• Language-specific spelling alphabets
  • Finnish Armed Forces radio alphabet
  • German spelling alphabet
  • Greek spelling alphabet
  • Japanese radiotelephony alphabet
  • Korean spelling alphabet
  • Russian spelling alphabet
  • Swedish Armed Forces radio alphabet
• Radiotelephony procedure
  • Procedure word
  • Brevity code
    • Ten-code
• Q code
• List of military time zones
• PGP word list

Look up ICAO spelling alphabet in Wiktionary, the free dictionary.

• "The Postal History of ICAO: Annex 10 - Aeronautical Telecommunications". ICAO. Archived from the original on 12 February 2019. Retrieved 6 November 2017.
• "NATO Declassified - The NATO Phonetic Alphabet". North Atlantic Treaty Organization.