NIU Shooter Steven Kazmierczak: Tatoos

Steven Kazmierczak, the shooter that killed 5 others and then himself at Northern Illinois University on February 14, 2008, has been reported with the following tattoos:

A skull pierced by a knife
A pentagram
A macabre character from the “Saw” horror movies, superimposed on images of bleeding slashes across his forearm.

The pentagram is a symbol with several associations in mathematics, Christianity, Judaism, Pythagoreanism (a metaphysical, mysctical, mathematical belief), Satanism and the Underworld.

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SAW (movie official site)