The acronym "AIC" is spelled using three letters, /eɪ/, /aɪ/, and /si/. The sound represented by /eɪ/ is as in the word "day", the sound represented by /aɪ/ is as in the word "eye", and the sound represented by /si/ is as in the word "see". The correct spelling of "AIC" should always be used in written communication to ensure clear and effective communication.