[PIF]

See these links for the start of your research into the question about:
“What the hell is a Pyramid Inch and how does that that relate to a standard unit of measurement?”

http://en.wikipedia.org/wiki/Pyramid_inch

http://www.absoluteastronomy.com/topics/Pyramid_inch

[Little Bill]

Egyptogist Flinders Petrie (1853–1942), whose father was a believer. When Petrie went to Egypt in 1880 to perform new measurements, he found that the pyramid was several feet smaller than previously believed. This so undermined the theory that Petrie rejected it, writing "there is no authentic example, that will bear examination, of the use or existence of any such measure as a ‘Pyramid inch,’ or of a cubit of 25.025 British inches."[6] WIKI, your post.