X-height

In typography, the x-height, or corpus size, is the distance between the baseline and the mean line of lowercase letters in a typeface. Typically, this is the height of the letter x in the font, as well as the letters v, w, and z. One of the most important dimensions of a font, x-height defines how high lowercase letters without ascenders are compared to the cap height of uppercase letters.

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Source: Wikipedia · Image: Wikimedia Commons · CC BY-SA 4.0

LETTERFORGE

The art of letters — calligraphy, hand-lettering, and type that speaks.

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