The most important devotion to Shiva, this mantra goes back literally thousands of years. In the sect of Shivanism, he is the god most widely associated with creation, preservation and ultimately destruction.
Om as we’ve talked about previously, is the universal sound and vibration.
Namaha means to bow as a sign of respect or admiration.
Shivaya refers of course to Shiva, but furthermore means “the inner self.”
When put together, the mantra means “I bow to the inner self.” It’s thought that regular practice of this mantra will bring you closer to the divine inner nature within all of us.