What is the Mac OS X term for an indicator of a process failure that makes an application unresponsive?

The term "Pinwheel of Death" specifically refers to the spinning beach ball icon that appears in Mac OS X when an application is unresponsive. This indicator signifies that the system is busy or that the application has encountered an error preventing it from processing requests. It's a visual cue to users that they may need to wait or take action, such as force quitting the unresponsive application.

While the spinning wheel is a commonly used descriptor for this icon, in the context of Mac OS X, it has colloquially been dubbed the "Pinwheel of Death" due to its frustrating association with application failures. Other terms like "application freeze" and "crash report" describe different scenarios related to application issues—freezes indicate a lack of responsiveness, while crash reports are generated after an application has unexpectedly terminated. However, they do not capture the specific visual representation of the failure indicated by the "Pinwheel of Death."