Mean line

Source: Wikipedia, the free encyclopedia.

In typography, the mean line is the imaginary line at the top of the x-height.[1]

A diagram showing the line terms used in typography

Round

typefaces, since this is aesthetically more pleasing, otherwise curved letters such as a, c, e, m, n, o, r, s, and u will appear visually smaller than flat-topped (or bottomed) characters of equal height, due to an optical illusion
.

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