Yes, it's "pinned" to stand out in a forum. It's usually an important topic, like the pinned one here. Only moderators can do it, though. Some people create Closed/Pinned topics, usually to prevent spam posts and pages getting overwritten.
I am a signature... But what am I if my master does not type anything on me? Wait...What am I saying, 'master'? I choose my own destiny... Ah, screw it! I'll stay in this bar for a couple of more years...