Pronunciation: [ˈɒtuːˌə͡ʊ] (IPA)
Correct spelling for the English word "OTOOO" is [ˈɒtuːˌə͡ʊ], [ˈɒtuːˌəʊ], [ˈɒ_t_uː_ˌəʊ] (IPA phonetic alphabet).
Correct spelling for OTOOO