So OM itself means the Atma belongs only to God, only to Lakshmi Narayana. And M comes from the Sanskrit word „Mah“, which means „mine“. M – stands for the Atma, because M is the 25th letter in the Sanskrit alphabet, and the 25th tattwa of creation (which means essence) is the Soul. U – means „only“ or it means Maha Lakshmi, because where Narayana is, Maha Lakshmi is also there. In our Sri Sampradaya, which is our Vaishnava tradition, the OM in Om Namo Narayanaya means:Ī – stands for Narayana, Maha Vishnu, because A is the first letter also in the Sanskrit alphabet, and as Jesus says that „I am the Alpha and the Omega, I am the first and the last“, so as A is first, Narayana is first, He is the first cause of everything. Keep in mind here that the Snaskrit OM sign is literally translated as AUM, however the pronunciation is OM.
Silcence – Turya, the supreme Conciousness, beyond the Gunas. In the Vedas it is explaned like this: A-Brahma (rajas), U – Vishnu (sattvas), M – Shiva (tamas).
OM itself is the primordial Consciousness, it’s Lakshmi Narayana, it’s Shiva Shakti, it’s the Oneness, and because it’s Oneness, each tradition can have its own interpretation.