What is the name of the GUI Android uses/has used?
It gets the name of the Android OEM front end interface :


Touchwiz for Samsung
HTC Sense for HTC
MotoBlur for Motorola
...


For the "basic" version of Android - i.e. the version embedded in Nexus phones and tablets - people often refer to the Android version as "stock Android". So what about "stock Android UI" or "stock UI" in this case ?