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A pica (pronounced "PIKE-ah", SAMPA /"paIk@/) is a unit of measure traditionally used in document layout. A pica measures <math>1/6<math> of an inch, and is used to measure the size of blocks of type, margins, and other macroscopic elements of page layout.
<math>1/12<math> of a pica is a point, which is the standard unit for measuring font size and leading. There are 72 points in an inch, or 6 picas in an inch.
A measurement in picas is usually represented by placing a small letter p after the number of picas. "10 picas" is thus abbreviated to "10p". Likewise, points are represented by placing the number of points after a small p, such as 0p5 for "5 points," 6p2 for "6 picas and 2 points," or 1p1 for "13 points" which is converted to a mixed fraction of 1 pica and 1 point.
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