The unusual spelling of the word "DADHVN" can be explained using IPA phonetic transcription. The first two letters "DA" represent the voiced alveolar stop /d/, followed by the voiceless glottal fricative /h/. The next two letters "HV" represent the voiceless labio-dental fricative /f/. Finally, the letter "N" represents the voiced alveolar nasal /n/. Therefore, the correct pronunciation of "DADHVN" would be /ˈdæd.həvən/. While this spelling may be confusing, it highlights the importance of using phonetic transcription to accurately represent spoken language.