The spelling of "Ureno" can be explained using the International Phonetic Alphabet (IPA). The first sound, "u," is pronounced as the vowel sound in "boot." The second sound, "r," is a rolled or trilled "r" sound. The third sound, "e," is pronounced as the vowel sound in "let." The final sound, "no," is pronounced as two syllables: the first syllable is pronounced with the vowel sound in "cut," and the second syllable is pronounced with the vowel sound in "goat." Therefore, the correct spelling of this word is "U-r-e-n-o."