This is the Hindu symbol for good Karma which is the cosmic principle according to which each person is rewarded or punished in one incarnation according to that person's deeds in the previous incarnation.
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.
Ganesh-Ganesha is worshipped as the lord of wisdom and success, beginnings and as the lord of defender and remover of obstacles, patron of arts and sciences. Ganesha is the lord with Elephant head. Ganesha elephant head has only one full tusk ,while other is broken. He said to have broke it to write The Mahabharat to the dictation of sage "Vyasa".