The inner margin of a book or document is the space bordering the edge that is bound or fastened. This space is crucial for ensuring text remains readable and pages can be turned easily without obscuring content near the spine.
In printing and book design, the term specifically used for this inner margin is the gutter. It's the area between the block of text and the binding.
The other terms refer to different elements:
Therefore, the inner margin is correctly identified as the gutter.
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