Symbol

Shabda

https://en.wikipedia.org/wiki/Shabda_Brahman
http://ajitvadakayil.blogspot.in/2014/04/shabda-brahman-beat-of-damarau-drum-of.html
http://www.shabdbraham.com/
https://www.youtube.com/results?search_query=Shabda+Brahman
https://www.slideshare.net/search/slideshow?searchfrom=header&q=Shabda+Brahman