Gutter
I think it is called a gutter
If the margin is written in, or meant to be written in, it is called a 'gloss'.
A comment in a margin is typically referred to as a marginal comment or a margin note. It is a brief notation or remark made in the margin of a document or a book to provide additional information, clarification, or thoughts related to the content.
The distance between the valve face and the head of the valve is called the margin.
its the sacral promontory... from the AP text book
margin
Neck
A leaf's edge is called its margin.
The recommended margin size for a 6x9 book layout is typically around 0.5 to 1 inch on all sides. This helps ensure readability and a visually appealing design for the book.
The type of margin that adds extra space to the left, top, or inside of a document, especially in bounded formats like books, is called a "gutter margin." This margin is specifically designed to accommodate binding and ensure that text does not get lost in the spine, providing a more readable layout. The gutter margin is usually wider than other margins to allow for this extra space.
Sahel
margin