Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. In typography and computing characters per line (CPL) or terminal width refers to the maximal number of monospaced characters that may appear on a single line. It is similar to line length in typesetting.At the end of the typewriter age, most designs were geared toward 72 CPL, derived from a pitch of 12 characters per inch, multiplied by 6 inches (see for example IBM Selectric). This would ensure at least 1 inch for each margin, with the U.S. government at the time having standardized on 8x11" paper. Early computer text editors used this measure as a baseline for their terminal interfaces. Other common measures were 80 CPL (historically descended from punched cards and later broadly used in monitor text mode), 40 CPL (in low-resolution screens) and 132 CPL.

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