aum

ॐ auṃ

An expanded spelling of OM written to show its three constituent sounds, A, U and M, whose analysis is the subject of the Mandukya Upanishad.

Where this term appears

The Vijnana Bhairava Tantra Lineages
Others use sound : follow the tail of a struck bell, or a chanted syllable like AUM , as it thins out and vanishes into silence, and go with it into the silence.
What Does Om Mean? Deities
the past, the present, the future, everything is just the word Om." Written out fully, Om is Aum , three sounds, and the Mandukya maps each onto a state of consciousness.
Not This, Not This Treatise
OM. Written also AUM.
Why is Om chanted at the start and end of prayers and yoga? Journal
A room of people, eyes closed, drawing one long note up from the belly. Aum.
Nada, Bindu, and Om Treatise
The opening line, in the old public-domain translations, is stark: "Aum!
The Fire She Came From Treatise
… that is the Tamil Siddha parallel to the Sri Yantra, and through her Aum-Sakti form that emerges in the practitioner’s own subtle body during meditation rather than from a cosmic fire-pit.