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Also to know is, what is a pica measurement?

A pica is a hair less than 1/6 inch, and contains 12 points. Picas are typically used to represent fixed horizontal measurements, most often column width. They are commonly used when designing newspapers, magazines, newsletters, and ads. Picas are designated with the letter p, such as 16p.

Secondly, what does 51p0 mean? When you see something like "51p0" that means that the measurement units are set to picas, not to inches. You can go to InDesign preferences (under the Edit menu in Windows or the InDesign menu on the Macintosh), and in Units & Increments, change your units to inches.

how many points is a pica?

12 points

How do you measure type?

The height of type is measured in points, and the width of a letter or a line of type is measured in picas. Point size is the height of the body of a letter in a typeface; originating in metal type, it was a slug of lead the typeface was set upon. The width of a typeface is measured in characters per pica.