A screw head
Split by <a href="//commons.wikimedia.org/wiki/User:Stannered" title="User:Stannered">Stannered</a>
2007-04-21
Own work based on: <span style="border:1px dotted #FC0;padding:0 4px"><a href="https://en.wikipedia.org/wiki/File:Screw_drive_types2.svg" class="extiw" title="en:File:Screw drive types2.svg">Screw drive types2.svg</a></span>