The NATO phonetic alphabet word for 'A' is 'ALFA'. The NATO phonetic alphabet, also known as the International Radiotelephony Spelling Alphabet, is a system used to accurately spell out words over radio or telephone communications. It was developed by the International Civil Aviation Organization in the 1950s and adopted by NATO in 1956. The alphabet consists of 26 words, each corresponding to a letter of the English alphabet. The word for 'A' is 'ALFA'.