The correct spelling of the word "carboni" is actually Carboni, with a capital C. It is an Italian surname that means "charcoal." The IPA phonetic transcription for this word is /karˈboːni/. It is pronounced with stress on the first syllable and has a long "o" sound followed by a short "i" sound at the end. The spelling is important to preserve the original meaning and proper noun status of the word.