Aum (also Om, Devanagari ॐ, Chinese: 唵) is a mystical or sacred syllable in the Dharmic religions. It is placed at the beginning of most Hindu texts as a sacred exclamation to be uttered at the beginning and end of a reading of the Vedas or previously to any prayer or mantra. The Mandukya Upanishad is entirely devoted to the explanation of the syllable.