The sound AUM represents the entire universe and it also signifies divinity.By recreating and meditating on its meaning,the aspiration develops introspection and overcomes obstructions to their spiritual and astral being.The sign in Hinduism,'AUM' is the most sacred Sanskrit syllable.In english 'A','U','M' represents the Trinity,which consists of three of the most elite Hindu Gods:Brahm,the creator,Vishnu,the preserves and Lord Shiva,the destroyer.There 3 letters when pronounced properly in unison can create a most magickal feeling on the human body,it also help open the ajna/brow chakra or third eye as many know it.