Aum Namah Shivaya is a mantra that purifies our system and helps bring meditativeness.

“Na-Ma Shi-Va-Ya” are called panchaksharas or five syllables. This mantra is a fabulous arrangement of just five syllables, which does phenomenal things. Through the history of time, probably the maximum number of people have realised their ultimate potential through these five syllables.
~sadhguru~