Which operating system is referred to by OSX?

OSX refers to the operating system developed by Apple Inc. specifically for their Macintosh computers. This system, often referred to as macOS in its later iterations, is designed to provide a user-friendly interface along with a robust set of features tailored for creative tasks, productivity, and security. Since the question requires identifying the correct representation of OSX, the choice that refers to the most recent version of Mac OS is accurate.

In earlier versions, the operating system was branded as Mac OS X, but it has evolved over the years, incorporating more modern features and enhancements that align with user needs and technological advancements. The designation of OSX as the recent version of Mac OS captures that evolution and acknowledges its identity as a desktop operating system distinct from other platforms. Thus, it directly addresses the naming and branding Apple utilized for their operating system series through its various updates and versions.