OM

http://www.swamij.com/om-namah-shivaya.htm
https://www.youtube.com/results?search_query=OM+Nama+Shivaya
http://www.slideshare.net/search/slideshow?searchfrom=header&q=OM+Nama+Shivaya

https://shivadurga.blogspot.com/search/label/Panchakshari
Sivoham
https://shivadurga.blogspot.com/search/label/Sivoham