Biohazard, warning sign 
<p>D-W016
</p>
 according to German standard DIN 4844-2
<a href="//commons.wikimedia.org/wiki/User:DrTorstenHenning" title="User:DrTorstenHenning">Torsten Henning</a>
drawn by <a href="//commons.wikimedia.org/wiki/User:DrTorstenHenning" title="User:DrTorstenHenning">Torsten Henning</a>