The "SarcMark" is used to emphasis sarcasm in a medium where tone of voice is not evident.  Similar marks have been proposed, such as the <a href="//commons.wikimedia.org/wiki/File:Irony_mark_full.svg" title="File:Irony mark full.svg">File:Irony mark full.svg</a>.
<a href="//commons.wikimedia.org/wiki/User:Quibik" title="User:Quibik">Quibik</a> (<a href="//commons.wikimedia.org/wiki/User_talk:Quibik" title="User talk:Quibik"><span class="signature-talk">talk</span></a>)
2010-01-20 19:29
<ul><li>Traced from <a href="//commons.wikimedia.org/wiki/File:Sarcasim_mark.png" title="File:Sarcasim mark.png">Sarcasim_mark.png</a></li>
<li>originally from: <a rel="nofollow" class="external text" href="http://gawker.com/5446209/new-sarcasm-punctuation-mark-makes-punctuation-cool-again">"New Sarcasm Punctuation Mark Makes Punctuation Cool Again"</a>, gawker.com</li></ul>