A symbol that conveys the concept of near-term "serious warning".
<a href="//commons.wikimedia.org/wiki/User:Perhelion" title="User:Perhelion">User:Perhelion</a> / Original: <a href="//commons.wikimedia.org/wiki/File:Gnome-emblem-important.svg" title="File:Gnome-emblem-important.svg">File:Gnome-emblem-important.svg</a>: <a rel="nofollow" class="external text" href="http://svn.gnome.org/viewvc/gnome-icon-theme/trunk/AUTHORS?view=markup">GNOME icon artists</a>
<span class="int-own-work" lang="en">Own work</span>; Modification of <a href="//commons.wikimedia.org/wiki/File:NotCommons-emblem-copyrighted.svg" title="File:NotCommons-emblem-copyrighted.svg">File:NotCommons-emblem-copyrighted.svg</a> and <a href="//commons.wikimedia.org/wiki/File:Gnome-emblem-urgent.svg" title="File:Gnome-emblem-urgent.svg">File:Gnome-emblem-urgent.svg</a>.