The spelling of the word "OUIO" is unusual and may seem confusing at first glance. However, the phonetic transcription of the word helps explain its spelling. The first two letters, "OU," are pronounced as /u/ in the IPA. The following letter, "I," is pronounced as /i/ in the IPA. Finally, the last letter, "O," is also pronounced as /u/ in the IPA. Therefore, the word "OUIO" is pronounced as /uːi'u/. Despite its peculiar spelling, the word can be pronounced correctly using the IPA phonetic transcription.