What is that little icon there?
Subscribe to RSS? Yeah, why not...
A bookmark?
Ahhh.. now I understand!
And the magical little line that makes it all happen:
<LINK REL="alternate" TITLE="Slashdot RSS" HREF="//slashdot.org/index.rss" TYPE="application/rss+xml">
Here's what the thing looks like in "that other wiki":