The spelling of the word "ESIRI" can be explained using IPA phonetic transcription. The first sound is a schwa, represented as /ə/, followed by the consonant /s/, and then a long /i/ sound, represented as /i:/, and finally the syllable ends with the letter /r/ pronounced as /r/. Therefore, the correct spelling of the word is "ESIRI". Understanding IPA phonetic transcription can be helpful in accurately spelling and pronouncing words, especially for non-native speakers.