This image is from a tutorial on making the cover for a long-stitched book.
Its caption in that context is as follows:
Basic dimensions of the cover.
Starting with a rectangle the size of one unfolded sheet of the
photocopied book, add the following dimensions to the width:
P -- the thickness of the stacked sections that will make up
the book's body, compressed and measured away from the creased edges.
T -- the thickness of the thread.
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