Tibetan Buddhist canon
Classical Mongolian language was the high register used for religious and official purposes while the various Mongolian dialects serve as the low register, like Khalkha Mongolian, Chakhar Mongolian, Khorchin Mongolian, Kharchin Mongolian, Baarin Mongolian, Ordos Mongolian, and the Buryat language. The Tibetan Buddhist canon was translated into Classical Mongolian. The Oirat Mongols who spoke the Oirat Mongol language and dialects like Kalmyk language or Torgut Oirat used a separate standard written with the Clear script.