Secret of OM
OM can be expanded as AUM for the pronunciation in English
Mandukya Upanishad is dedicated to explaining OM
Yet most of us do not know what it is.
Here below the first verse of Mandukya Upanishad defines it
The syllable Aum, which is the symbol of Brahman, stands for the manifested world, the past, the present, and the future, as well as the un-manifested absolute
To get a deeper explanation and more understanding watch the below video
The below graphic gives us the ability to visualize it