Om - This is a Hindu symbol and it represents the three gods Brahma, Vishnu and Maheswara. It is also the meditation symbol. It will increase breathing capacity and clean the respiratory system. If it is chanted in a particular manner, it will increase the concentration and leads to good health.
This is the most universal of Hindu symbols and its sound is used in meditation. In Hinduism, the word “Om” is the first syllable in any prayer. More specifically, Om is used to symbolize the universe and the ultimate reality.