I just noticed this icon again today, and its apparent demise.
So, you have the Apple CHUD Tools (somewhat low-level debugging tools) installed. What if you needed to un-install them?
It used to be that you needed some industrial strength CHUD Remover. Here is the CHUD Tools un-installer application icon.
Unfortunately the CHUD Remover is no longer needed. Apparently you can just delete the stuff now.