What's the Indentation logo on footwear?

Indentation refers to the process of changing the thickness of the sheet material under the action of the mold, and pressing the undulating patterns or words on the surface of the part is called indentation or imprinting.  See below a photo of sneaker,on which the flower and heart belong to indentation pattern.

The various embossed graphics and patterns of the embossing show patterns of different depths and have a clear sense of relief, which enhances the three-dimensional sense and artistic appeal of the printed item.