What is the meaning of this icon in Xcode 7 debug navigator?

This icon appears beside my program name in the debug navigator when running in the debugger in Xcode 7. I think it's new. I assume it means my lights are on. I checked, though, and they're off. Any other ideas?

Solution

It indicates an open crash report. If you open a crash report from the Organizer, it opens in the debug view and shows you the running threads and stack status from the crash report. I forgot I had one open. There's no way to close it that I can find.