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An em (from em quadrat) is a unit in the field of typography, equal to the currently specified point size. For example, one em in a 16-point typeface is 16 points. Therefore, this unit is the same for all typefaces at a given point size. [1] The em space is one em wide. Typographic measurements using this unit are frequently expressed in ...
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 (the source of the term), as well as the letters v, w, and z. (Curved letters such as a, c, e, m, n, o, r, s, and u tend to exceed the x ...
In typography, the point is the smallest unit of measure. It is used for measuring font size, leading, and other items on a printed page. The size of the point has varied throughout printing's history. Since the 18th century, the size of a point has been between 0.18 and 0.4 millimeters. Following the advent of desktop publishing in the 1980s ...
"number") is added to the end of the size name to clarify the meaning. Note that the Chinese font sizes use American points; the Continental systems traditionally used the Fournier or Didot points. The Fournier points, being smaller than Didot's, were associated with the names of the Didot type closest in size rather than identical in number of ...
Pitch is the number of letters, numbers and spaces in one inch (25.4 mm) of running text, that is, characters per inch (abbreviated cpi), measured horizontally. [1] [2] The pitch was most often used as a measurement of the size of typewriter fonts as well as those of impact printers used with computers.
An agate (US) or ruby (UK) is a unit of typographical measure. It is 5.5 typographical points, or about ⁄13 inch (1.94 mm). It can refer either to the height of a line of type or to a font that is 5.5 points. An agate font is commonly used to display statistical data or legal notices in newspapers. It is considered to be the smallest point ...
In typography, the body height or point size refers to the height of the space in which a glyph is defined. The metal sort: b is the body or shank, c is the body height or font size. Originally, in metal typesetting, the body height or the font (or point) size was defined by the height of the lead cuboid ( metal sort) on which the actual font ...
Note that Aicher's font sizes are based on the DIN standard then in development, which uses the H-height, whereas in lead typesetting the larger cap height was used.Some typographers have proposed using the x-height instead, because the psychological size depends more on the size of default, lowercase letters.