In typography, cap height refers to the height of a capital letter above the baseline for a particular typeface. It specifically refers to the height of capital letters that are flat—such as H or I—as opposed to round letters such as O, or pointed letters like A, both of which may display overshoot. The height of the small letters is referred to as x-height.
- http://pfaedit.sourceforge.net/glossary.html Glossary of (some) Typographic Terms
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