What tool does this SF icon represent on Eclipse? Who can tell me what it is? And how can I use it?

The ‘SF’ icon the red S and blue F.

I know that this is similar with hover help in Eclipse. But the SF is different with the hover.

I had used google image search, and yandex image search for it, but I still don’t get the anwer.I even don’t know what is the key word about this staff.

I also searched in youtube, but I didn’t find a tutorial about this staff.