The spelling of the word "AESSAM" can be explained using the International Phonetic Alphabet (IPA). The first two letters "AE" are pronounced as /eɪ/, which is a diphthong that sounds like "ay". The following "SS" is pronounced as /s/ which is a voiceless alveolar fricative. The final three letters "AM" are pronounced as /æm/ which is a nasal sound of the vowel "a" followed by consonant "m". Therefore, "AESSAM" is pronounced as "ay-sam" with emphasis on the first syllable.