A Classical Dictionary of Hindu Mythology and Religion, Geography, History, and Literature c5.1284

c5.1284

OM. A word of solemn invocation, affirmation, benediction, and consent, so sacred that when it is uttered no one must hear it. The word is used at the commencement of prayers and religious ceremonies, and is generally placed at the beginning of books. It is a compound of the three letters *a*, *u*, *m*, which are typical of the three Vedas; and it is declared in the Upanishads, where it first appears, to have a mystic power and to be worthy of the deepest meditation. In later times the monosyllable represents the Hindu triad or union of the three gods, *a* being Vishnu, *u* Siva, and *m* Brahmā. This monosyllable is called Udgītha.