Cross of a <a href="https://en.wikipedia.org/wiki/human_tooth" class="extiw" title="en:human tooth">human tooth</a>
<a href="//commons.wikimedia.org/wiki/User:Afanasovich" title="User:Afanasovich">Afanasovich</a>
<span class="int-own-work" lang="en">Own work</span>