"A new hidden context menu, called the Win+X menu, has been added to Windows 8 that is available by moving your mouse to the extreme lower, left corner of your screen and right-clicking. If you only want access to a few frequently used programs, you can now add your own shortcuts to the Win+X menu. Recently, we showed you how to manually add items to the Win+X menu. We found a free tool that allows you to easily add, remove, and reorder items on the Win+X menu."
As far as I know this isn't an official name, but WinX is the one I hear most often because you access it by hitting the Windows+X keys. It opens up shortcuts to:
Programs and Features
Command Prompt - Opens the Command Prompt.
Command Prompt (Admin)
Task Manager - Opens the Task Manager.
Control Panel - Opens the Control Panel.
File Explorer - Opens File Explorer.
Search - Opens the Search charm.
Shut down or sign out