Other typographic facilities
Width and spacing
In graphic design, the space around letters and words is often as important as the letterform itself. When characters are designed, they are also given space either side to prevent consecutive sorts from touching. These are called side bearings, and the information about horizontal spacing built into a typeface by its designer is known as its font metrics.
The width of a line of setting, or the column width of a publication, is called the measure, and is sometimes measured in picas, but more usually nowadays in millimetres. As we have seen, another convenient method of measurement is the em. The em is not an absolute measurement. Its size will vary depending on the typeface and its point size. A ...