Similar design (smiley face with horns) used by the alleged smiley face killer(s). Actual design of the symbol found at the crime scene may be copyrighted under U.S. law (as seen on a crime scene image at the <a rel="nofollow" class="external text" href="http://ac360.blogs.cnn.com/2008/05/21/behind-the-scenes-investigating-the-smiley-face-killer/">AC360 Blog</a>)
<a href="//commons.wikimedia.org/wiki/User:Militaryace" title="User:Militaryace">Militaryace</a>
<span class="int-own-work" lang="en">Own work</span>