On some occasions, several browsers look for an icon file 'favicon.ico' in the root directory of the server.
Browsers known to do this:
How to Make a Favicon.ico
FaviconDotIco was introduced by the MicrosoftInternetExplorer 5. MSIE4 also displayed custom icons in the address bar and on internet links. Did it use a different mechanism for this?
The one for c2 (now showing up above, at least with e.g. Firefox) is...a dead cricket, toes up, right? :-)
See http://c2.com/ for the full sized logo.
Well, shrunk down to the size of the URL window on my browser, it looks like a dead bug. More of a cockroach than a cricket, though.
At least it makes sense: part of our job, as programmers, is killing bugs. :)