Symbol for marking invalid SVG source code. Validated by <a rel="nofollow" class="external text" href="http://validator.w3.org">W3C validator</a>.
<a href="https://en.wikipedia.org/wiki/World_Wide_Web_Consortium" class="extiw" title="w:World Wide Web Consortium">W3C</a>
CC BY 2.5
<ul><li><a rel="nofollow" class="external free" href="http://www.w3.org/Icons/">http://www.w3.org/Icons/</a></li>
<li><a rel="nofollow" class="external free" href="http://www.w3.org/Graphics/SVG/">http://www.w3.org/Graphics/SVG/</a></li></ul>