HALOS - Home Appliance Label and Overlay System.
Microwave Package Tactile Icon Description.

Start - the shape is a right pointing triangle.
Stop/Cancel - the shape is an X.
Power Level - the shape is a stairstep, increasing from left to right.
Add Time - the shape is a plus sign.
Popcorn - the shape is curvy, representing a popcorn kernal.
Pizza - the shape is triangular like a slice of pizza, the top edge is wavy representing pizza crust.
Potato - the shape is a wide oval with a rough top, like a baked potato.
Defrost - the shape is a water droplet - pointy on top, circular on the bottom.
Timer - the shape is an hourglass, like a triangle on the bottom and an up-side-down triangle on the top.

website:  tangibleSurfaceResearch.com/halos