What is that on the thread status icon?

[light_bulb]

looks like a cartoon bomb? one more thing what's with the additional rectangle icon on the right hand side?

 

[Doc Al]

The bomb!

I see what you mean: The thing that looks like an envelope with a bomb on it. That means that you have posted in that thread. (Somewhere there's a guide to those symbols.)

 

[dontdisturbmycircles]

https://www.physicsforums.com/Nexus/statusicon/thread_dot.gif - you have posted in this thread (any envelope with a dot in the middle means you have posted in the thread, scroll over it to see how many times you have posted in the thread)

https://www.physicsforums.com/Nexus/statusicon/thread_hot.gif - hot thread, lots of activity (lots of views, I think)

https://www.physicsforums.com/Nexus/statusicon/thread_dot_lock.gif - thread is locked and you have posted in it

https://www.physicsforums.com/Nexus/statusicon/thread_lock.gif - thread is locked and you have not posted in it (not 100% sure on this one)

https://www.physicsforums.com/Nexus/misc/paperclip.gif - Someone has attached something to this thread (its either this or the thing that shows there is a poll going on that you are talking about when you talk about the rectangle to the right I would guess..) Or it could be the thumb tack icon which denotes that a thread has been sticked (not really rectangular though :D)

 

[mbrmbrg]

I had the https://www.physicsforums.com/showthread.php?t=145484"; verdict was that the bomb was actually...you!

 

[light_bulb]

i guess it isn't the good kind of bomb