What is the design pattern of WordPress Core? As this Stack Overflow question shows, WordPress does not follow the MVC pattern; however, developers can write plugins and themes that follow MVC. But my question pertains exclusively to WordPress Core, not to any additional add-ons, themes, extensions, plugins, or forked projects that may or may not follow an MVC pattern.
If WordPress Core does not follow an MVC design, then what design pattern does it follow?