Bleed is the word used to describe the region that extends beyond the edges of, let’s say, a rectangle.
What is the word used to describe the region that converges towards the center of the rectangle?
Answer
If what you mean is an area that is left (mostly) empty to prevent content from being flush to the edge of the medium, then margin is the world you are looking for.
Attribution
Source : Link , Question Author : Hisham Maudarbocus , Answer Author : Vincent