Sorry about the dumb subject line...but, part of this query is that I don't know what the "thing" is called that I'm asking about...

I was tinkering and clicked on wbar, which put a bunch or icons across the top of my workspace. At that point I still had the icons in the lower left for system tools, filemanager, iceweasel, etc.
Not wanting to play with wbar, it clicked on the tube icon and clicked remove...wbar didn't go away, the icons for system tools, filemanager, iceweasel, etc.
did. Now I have only the tube icon.
What are they called (or what is the "thing" they are on called) and how do I get them back?
(if the tube icon wasn't a giveaway; this is 5.0.3 AVL)
Regards,
Mac