Om - ॐ
Om/Aum is a mantra and mystical sound of Hindu origin, sacred and important in various Dharmic religions such as Hinduism, Buddhism and Jainism.
This ॐ signal was based on Dalpek's excellent iLoveU Signal http://www.thingiverse.com/thing:666412. I just clipped out the heart and replaced it with an ॐ.
This prints fine with no support on my Printrbot Simple Metal, and should do the same on most printers.
Hold it with two fingers in front of your phone's flashlight or another light source to project ॐ on the wall.