Ted Nelson's term, which Don Hopkins adopts:

The term "intuitive" is stupid. Because, is a mouse "intuitive"? You look at it, and oooh, oooh, oooh. But the moment you see it work, it has revealed itself. So it's "self revealing", is the term. Pac-Man is another very nice example...

Ted credited the term to his supervisor at Datapoint.

Pie menus in HyperTIES either lead, follow, or get out of the way. When you don't know them, they lead. When you are familiar, they follow. When you are really familiar, you don't see them, unless you stop. Every selection practices the motion to mark ahead.

CHI '88: Callahan, Hopkins, Weiser, Shneiderman — pie menus 15% faster than linear menus, significantly lower error rate. Mark Weiser, before ubiquitous computing.

Don's standing ask: all web browsers and desktop UIs should natively support user-definable pie menus, the way HyperTIES did and Blender does.