At how things are actually aligned with respect to each other.

E.,g. in forms all icons are aligned to the top of the input fields they are related to. In titles almost nothing is visually aligned with the center of the title text: the hamburger and the arrows are lower. In menus triangles/arrows are below the visual center of the text. Headers for some reason offset from the left etc.

The results is a disjointed collection of elements that are just crudely assembled together with no rhyme or reason.