One example of the international sign of civil defence according to <a rel="nofollow" class="external text" href="https://www.icrc.org/applic/ihl/ihl.nsf/Treaty.xsp?documentId=A1D622EE77F6964A41256650004C9909&amp;action=openDocument">Annex I to Protocol Additional I to the Geneva Conventions of 1949: Regulations concerning identification, as amended on 30 November 1993</a>.
Original SVG: <a href="//commons.wikimedia.org/wiki/User:MStankie" title="User:MStankie">MStankie</a>
<span class="int-own-work" lang="en">Own work</span><br><a rel="nofollow" class="external text" href="http://www.airliners.net/photo/France---Securite/Eurocopter-Kawasaki-EC-145-(BK-117C-2)/2409122/L/&amp;sid=d664e12e9e53536801c51890b904f8d7">Securite CivileEC145</a>