A fire-extinguisher symbol
<a href="https://en.wikipedia.org/wiki/American_Institute_of_Graphic_Arts" class="extiw" title="w:American Institute of Graphic Arts">American Institute of Graphic Arts</a>
Original design:1979
From <a rel="nofollow" class="external text" href="http://www.aiga.org/content.cfm?ContentID=147">AIGA symbol signs collection</a>