Football helmet.
<a href="https://en.wikipedia.org/wiki/User:Rolando" class="extiw" title="en:User:Rolando">Rolando</a>
CC BY-SA 3.0
In <a href="https://en.wikipedia.org/wiki/Image:Kit_helmet_af.png" class="extiw" title="en:Image:Kit helmet af.png">English Wikipedia</a>.