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.