:Ex (typography) redirects here. For other uses of the term “ex”, see Ex (disambiguation). In typography, the x-height or corpus size refers to the distance between the baseline and the mean line in a typeface. Typically, this is the height of the letter x in the font (which is where the terminology came from), as well as the a, c, e, m, n, o, r, s, u, v, w, and z. However, in modern typography, the x-height is simply a design characteristic of the font, and while an x is usually e… (More on X-height)