The shape is a stairstep increasing to the right, representing increasing levels.
This shape is used in the HALOS library to represent a microwave power level and a washing machine soil setting. The icon is a control that modifies the level of something. Ever see volume settings on audio equipment represented as a bar graph? That is the idea. These are vertical lines that increase in height to show different levels. Visually that is accomplished. Perhaps the sharp inner cuts could be replaced with small but smooth curves to minimize cleaning issues. Then again the cutters are not that accurate so sticking with this design.