I would call that the door jam area.
hguiolmhy
The name for a region of a closed figure is the Area.
corpuschl.com offers concealed carry classes in that area.
This area is called the oropharynx.
area
The mantle is the newest part of the clam's shell. At the edge of the mantel there is a thicker area of muscle which turns into new shell as the clam grows.
I think it's called a contigous region, or maybe a bounded area, something like that.
closed to slavery
It is a manglicized version of the French name ah-ah (or Ah! Ah!). It was possibly called this because the concealed ditch or retaining wall was a surprise. It is used to keep animals out of an area of garden while preserving the view.
Valence shell
A person can locate a Shell Service Station in their area by going to their local phone book or doing a name reverse search. Other ways to locate a close Shell Station is by going to a Shell Station locator, which will map out the closest shell station to where you are located.
Pressure. If this is in the open air rather than a closed vessel, it is called atmospheric pressure.
the area is that 2 dimensional space inside of the closed figure. normally specified as square centimeters or square inches