In typography, the term "cap line" refers to an imaginary line that defines the height of capital letters in a typeface. It is one of the key elements in typographic measurements, alongside other terms like baseline (the line on which most characters sit) and x-height (the height of lowercase letters, excluding ascenders and descenders).
The cap line is particularly important in type design, as it helps to establish the visual balance and consistency of text. It ensures that uppercase letters do not extend too high or too low relative to other elements in the typeface. Understanding these baseline measurements is crucial for effective typography, layout, and design.
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