Om/ Aum as a resplendent humming sound (Vairaja pranava), having four parts through which one can reach the inner sound (nada) in the right ear.

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The Nadabindu Upanishad describes Om/ Aum as a resplendent humming sound (Vairaja pranava), having four parts through which one can reach the inner sound (nada) in the right ear. When it is heard all external sounds disappear and one is able to listen to various subtle sounds whereby he becomes a videhamukta (freed from the body). According to the Hamsa Upanishad, nada manifests itself as ten different sounds, which are heard by adepts and yogis in the subtle planes in the progressive stages of their spiritual advancement. Hearing them is a sure sign of success on the path. These sounds are the sound of cini, of cini-cini, of bell, of conch, of harp, of cymbals, of flute, of kettle drum, of tabor and of thunder clap. Of these only the last one should be cultivated. Different physical symptoms said to arise in the mind and the body as these sounds are heard, such as shaking of the head and sweetness in the mouth. When finally the last mentioned sound (thunder clap) is heard, one becomes identical with the transcendental Self (para Brāhman). The tantra shastras recognize Om/Aum as the seed (bija) mantra and suggest its association with other mantras and names of Shiva, Shakti and other divinities so as to increase their potency and vibration and hasten the process of purification and self-realization. Some of the well known and powerful mantras which are used in association with Aum as the prefix are ;
Om Namah Shivaya.
Om Namo Bhagavate Vasudevaya.
Om Ganeshaya Namah /Om Namah Ganeshaya.
Om Shri Durgayi Namah.
Om Namo Narayanaya
Om Namo Bhagwate Rudaraya Namah.