The spelling of the word "Petroa" can be explained using IPA (International Phonetic Alphabet) phonetic transcription. It would be written as /pɛtroʊə/. The "p" sound is represented by the symbol /p/, the "e" sound by /ɛ/, the "t" sound by /t/, the "r" sound by /r/, the "o" sound by /oʊ/, and the final "a" sound by /ə/. When pronounced, the emphasis should be on the second syllable, "tro". The word "Petroa" itself does not have a known meaning in English.