Aum is a universal mantra fit for all people and one not need the initiation of a master or guru to reap it's endless benefits. It must be understood that Aum is the underlying current permeating the universe, is prior to the gunas, the senses, the material world thus the mind and religious affiliation.
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.
OM necklace, Om pendant, aum, symbol pendant, yoga zen, meditation, hinduism symbol, good vibration, mantra- made to order by SweetlyART on Etsy https://www.etsy.com/listing/165761199/om-necklace-om-pendant-aum-symbol