The word "OEOU" may seem like a jumbled mess of letters, but it actually has a unique spelling pattern. Using IPA phonetic transcription, the first two letters "OE" represent a diphthong sound, similar to the "oy" sound in "toy." The next letter "O" represents a vowel sound, like the "o" in "hot." Finally, the last letter "U" represents an "oo" sound, like the one heard in "flood." While unconventional, the spelling of "OEOU" follows a consistent sound pattern.