Guttering -

: Prevents text from being obscured or lost in the binding.

Beyond physical books, the term is used in digital layouts to manage "white space." GUTTERING

: In software like Word or Google Docs, you use "mirror margins" so the gutter stays on the inside edge of every page. 🛠️ The "Gutter" in Digital Design & Code : Prevents text from being obscured or lost in the binding

The gutter ensures that text doesn't disappear into the "fold" (the spine) of a bound document. GUTTERING

Gutter highlights how-to - Technical Support - Sublime Forum

In publishing and design, the is the crucial extra space added to the inside margin of a layout to account for binding. 📖 The "Gutter" in Text & Publishing