The spelling of the word "SIOPESI" can be explained using the International Phonetic Alphabet (IPA). The word is pronounced as /si.o.pe.si/ where the first syllable is pronounced as "see", the second syllable is pronounced as "oh", the third syllable is pronounced as "peh", and the final syllable is pronounced as "see". The spelling of the word follows the standard rules of English phonetics where each letter represents a particular sound. Understanding the phonetic transcription of words can help in proper pronunciation and also in accurate spelling of words.