NATO phonetic alphabet by those who exchange voice messages by radio or telephone, regardless of language differences or the quality of the communication channel. The 26 code words in the NATO phonetic alphabet are assigned to the 26 letters of the English alphabet in alphabetical order as follows: , Bravo, Charlie, Delta, Echo, Foxtrot, Golf, Hotel, India, , Kilo, Lima, Mike, November, Oscar, Papa, Quebec, Romeo, Sierra, Tango, Uniform, Victor, Whiskey, X-ray, Yankee, Zulu. Strict adherence to the prescribed spelling words is required in order to avoid the problems of confusion that the spelling alphabet is designed to overcome. As noted in a
Extensions to the International Phonetic Alphabet in the extIPA chart that do not occur in the IPA chart: "fricative lateral + median" (simultaneous grooved and lateral frication), "fricative nasal" (a.k.a. nareal fricative) and "percussive". A denasal row is added here. Several new columns appear as well, though the linguolabial column is the result of a standard-IPA diacritic. Extensions to the International Phonetic Alphabet The extensions to the International Phonetic Alphabet, also extIPA symbols for disordered speech or simply extIPA (), are a set of letters and diacritics devised by the International Clinical Phonetics and Linguistics Association to augment the International Phonetic Alphabet for the phonetic transcription