Glossary

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The edge of book pages opposite the spine. This is the edge that is normally grasped when turning pages.

Flush binding is a binding whose cover is the same size as the sections.

FLush cutting is where the cover of a book is cut to the same size as the sections or pages within the book.  Most paperback books are flush cut.

Traditional usage: A folio is a sheet of paper folded once in the middle, making four pages of a book. It may also be called a signature.

Common usage: A folio is a numbered page of a book or the actual number printed on the page. “Low folio” refers to the half of the folio in the front part of the book, or the half of the folio with the lowest numbers. “High folio” refers to the half of the folio in the back part of the book, or the half of the folio with the highest numbers. It is occasionally used to describe a large book, 15 or more inches high, made with folded pages. The term comes from Latin folio, meaning a leaf. 

The foot is the bottom page edges or the bottom of the spine.  The term foot is used instead of bottom to prevent confusion on projects like a calendar where the foot of a page might be at the back and top of the calendar when unfolded and hanging on the wall