In typography, the x-height or corpus size refers to the distance between the baseline and the mean line in a typeface. Typically, this's the height of the letter x in the font (which's where the terminology came from), as well as the u, v, w, and z. (Curved letters such as a, c, e, m, n, o, r and s tend to exceed the x-height slightly, due to overshoot.) However, in modern typography, the x-height's simply a design characteristic of the font, and while an x's usually exactly one x-height in he… (More on X-height)