The spelling of the word "sissom" is phonetically transcribed as /ˈsɪsəm/. In this pronunciation, the first syllable is pronounced as "sis" with a short "i" sound, followed by the second syllable "som" pronounced with a short "o" sound. The spelling of the word may seem unusual and unfamiliar to many, as it is not commonly used in everyday language. However, the IPA phonetic transcription provides a clear guide to the correct pronunciation of the word for those who encounter it.