The spelling of the word "phau" might seem strange at first, but it actually follows the rules of phonetic transcription. In IPA, "ph" represents the unvoiced labiodental fricative sound /f/. The letter "a" is pronounced as the short vowel /æ/. And finally, the letter "u" represents the vowel sound /u:/, as in "flu" or "blue". So, when spelled out phonetically, "phau" is pronounced /fæu/ with the stresses on the first syllable.