Om is the best known bija mantra , the Supreme Consciousness, the audio of Brahman, or even the Vedas. The initial sound which was designed in the beginning of the universe was Om. The many mantras of Sanatan Dharma are recited using this seem. is built up of 3 letters https://fernandoutrok.blogrenanda.com/29544134/how-beej-mantra-can-save-you-time-stress-and-money