inset
1. A section placed within another section so that
the subsequent sewing passes through the folds of
both. The inset may be four pages only or
multiples of four pages and may be placed in the
center of the outer section, or on the outside,
where is is wrapped around the main section. In
rare cases it is sometimes located in some
intermediate position. Insetting is of
considerable importance as a method of
incorporating plates into a section without
resorting to tipping-in. Where the plates are on
the outside of the section they are sometimes
referred to as "outserts" or "wrap arounds." If
the section to be insetted is required to complete
the succession of pages, it is called an "offcut."
2. A small map, illustration, etc., set within the
border of a larger one. (58 , 82 , 287 )