OM is not a word but rather intonation, it is made up of three Sanskrit letters aa,au and ma which,when combined together make the sound Aum or Om. OM is of paramount importance in Hinduism. This symbol is a sacred syllable representing Brahman, the impersonal Absolute of Hinduism -omnipotent and omnipresent, and the source of all manifest existence.
The four parts of the symbol OM symbolize four stages of consciousness: Awake, sleeping, dreaming, and a trance or transcendental state.
According to Mandukya Upanishad ( The Upanishads are writings forming the core of Indian philosophy) 'OM is the one eternal syllable of which all the exists is but the development'. The past, the present ,and the future are all included in this one sound, and all that exists beyond the tree forms of time is also implied in it.
OM provides a dualistic viewpoint.On one hand, it projects the mind beyond the immediate to what is abstract and inexpressible . On the other hand,it makes the absolute more tangible and comprehensive. It encompasses all potentialities and possibilities ; it is everything that was,is or can yet be . It is omnipotent and likewise remains undefined.
It is believed to be the basic sound of the world and to contain all other sounds.This is a mantra (the mother of the mantras) or prayer in itself.If repeated with the correct intonation, it can resonate throughout the body so that the sound penetrates to the centre of one's being, the atman or soul.
During meditation when we chant OM, we create within ourselves vibrations that attunes sympathy with the cosmic vibration and we start thinking universally.OM Namah ShivayaEnjoy your chanting and its benefits on you soul! Namaste