Niotio is a non-existent word and doesn't have any fixed spelling. However, its pronunciation can be represented with the IPA phonetic transcription /ni'oʊtioʊ/. The word starts with the nasalized sound /n/ followed by the stressed vowel /i/, and then a glottal stop /ʔ/ before the second syllable. The second syllable contains the diphthong /oʊ/ and ends with the open vowel /i/ sound. The phonetic transcription helps in understanding the correct pronunciation of words, especially for non-native speakers.