“OM” or … @Globox822
“OM” or “AUM” has been called the “Sound of the Universe” as it is believed that the whole Universe, in its fundamental form, is made up of vibrating, pulsating energy. Om is considered as the humming sound of this cosmic energy and is the most important and significant word of Mantra tradition. Moreover, OM is the most often chanted sound among all the sacred sounds on earth. This sound is considered as the sound of the existence too.
… @uncomentario ..
Om is composed of the three sounds a-u-m (in Sanskrit, the vowels a and u coalesce to become o), which represent several important triads: the three worlds of earth, atmosphere, and heaven; the three major Hindu gods, Brahmā, Vishnu, and Śiva; and the three sacred Vedic scriptures, Ṛg, Yajur, and Sāma. Thus Om mystically embodies the essence of the entire universe.
You can check details meaning of OM at: