ॐ is the best name of God because its vibrations bring positive energy to the devotees. In Hindu tradition, the goddess Tripusundari is considered to be the best manifestation of divinity. That is why when we chant Om, the image of the Sri Yatra of this goddess is formed on the astral plane. This means that there are 6 Devi Tripurasundari forms. Om is recited at the beginning of all mantras. Purity is attained by continuity of mind, creativity, intelligence, knowledge, protection, charm and prosperity. You can put it on a wall in your drawing room, place of worship etc.