This is how the 10k tools currently looks like on Physics, more specifically the migration tab.
Are those Google Plus icons intentional? 'cause I smell a bug =).
The googley icons persist if I log in on an incognito chrome window, and they were also observed by a P.SE moderator.
If I go in to inspect, I get that the responsible element is
<span class="migrated from"></span>
whose background image is set to http://cdn.sstatic.net/Sites/physics/img/sprites.png?v=6f2a56ff0bac:
I'm not sure what this thing is, or how the css manages to pick out just the google plus icon from there, or indeed what sort of html black magic is going on here, but if a designer sees this I imagine they'll be able to figure out what went wrong.