<http://schema.org/description>
"Twitter is now rolling out the ability for you to click on stock symbols with a $ sign in front of them.  Once you click them, you'll be able to see all of the conversation about a ..."^^<http://www.w3.org/2001/XMLSchema#string>
<http://thenextweb.com/twitter/2012/07/31/twitter-rolls-out-clickable-stock-symbols-so-you-can-keep-up-with-your-investments/>