注é³ç¬¦èå¿µè¬ æå¸Bopomofo or Zhuyin Fuhao, often abbreviated zhuyin, is a phonetic system for transcribing Chinese, especially Mandarin, for people learning to read, write or speak Mandarin. This semi-syllabary is currently in wide use in Taiwan (see Uses). Consisting of 37 letters and 4 tone marks, it is a comprehensive system that can transcribe all the possible sounds in Mandarin.