Dzongkha Braille, or Bhutanese Braille, is the braille alphabet for writing Dzongkha, the national language of Bhutan. It is based on English braille, with some extensions from international usage. As in print, the vowel a is not written. Despite Dzongkha and Tibetan using nearly the same alphabet in print, the braille alphabets differ radically, with Tibetan Braille closer to German conventions and assigned letter values according to different sound correspondences.