The phonetic alphabet is as follows:
A google search would tell you that the Phonetic Alphabet assigns a word to each letter in the English alphabet, so that letters can be exchanged easily and with clarity. Instead of saying “ABC,” you would say “Alpha, Bravo, Charlie.”
To elaborate, communication via radio is notoriously unintelligible. If you listen to ATC (Air Traffic Control) chatter, you’ll notice a considerable amount of background noise when a general aviation pilot is on the mic.
Note, as well, that 9 is “niner”, to prevent confusion with “five.”