The meaning of OM and its vibrational essence within

What is the meaning of OM and its essence? Why it is so important that almost everyone knows this ancient Hindu/ Vedic Symbol. OM or AUM (Sanskrit: ॐ) is a sacred sound scripture symbol, representing the universe within its vibration. It is also a mantra in Hinduism, Buddhism and Jainism. I notice in my Yoga classes that everyone accepts…