Om Namah Shivaya

Oṁ namaḥ śivāya (Sanskrit: ॐ नमः शिवाय; IAST: Om Namaḥ Śivāya) is one of the most popular Hindu mantras and the most important mantra in Shaivism

In Siddha Shaivism tradition Nama Sivaya is considered as Pancha Bodha Tatva of Lord Shiva and his universal oneness of five elements:

"Na" sound represents earth

"Ma" sound represents water

"Si" sound represents fire

"Va" sound represents Pranic air

"Ya" sound represents sky

Its total meaning is that universal consciousness is one.