Tipografie si design
The amount to which a round or pointed letter extends beyond comparable letters with flat tops or bottoms. This optical correction prevents those letters from appearing smaller.
Font Shop Glosary
In order for the curved shape of the O to appear to be the same height as the flat top of the I it tends to overshoot the cap-height (or x-height), or undershoot the baseline by about 3% of the cap-height (or x-height). For a triangular shape (such as A ) the overshoot is even greater, perhaps 5%. These guidelines are based on the way the eye works and the optical illusions it generates and are taken from Peter Karow s Digital Formats for Typefaces, p. 26). The overshoot is also dependant on the point-size of a font, the larger the point-size the smaller the overshoot should be. Generally modern fonts will be used at multiple point-sizes, but in some font families there are multiple faces for the different point-sizes, and in such a case the overshoot will probably vary from face to face. See also X-height, Cap-height, Ascender, Descender, Baseline.
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