The enclosed area of a character is called a bowl. Once a bowl is created, the space is then called a counter. A counter is also defined as a partially enclosed space or area of a character.
The enclosed area of a character is typically referred to as its "bounding box" or "bounding area." It represents the smallest rectangular area that encompasses the entire character, including any whitespace or gaps within the character's design. This measurement is commonly used in computer graphics and font design to determine the size and positioning of characters.
quadrilateral
The area for jousting is called a "Tiltyard".
The fertile creasent!
If it's a 3 dimensional shape then it is volume otherwise it is surface area
In the subject art an area enclosed by a line is a shape.
It could possibly be called a narthex, but is probably more commonly known simply as the 'Front Porch'!
Exactly as in the question and a segment of a circle is the area enclosed by a chord and an arc of a circle.
The area enclosed by a chord is equal to the area enclosed by a segment minus the area enclosed by the triangle with the same corners as the segment. To visualise it, draw a circle and put a chord on it. Label the chord AB and the centre of the circle C. The area of sector AB equal to the area of sector ABC minus the area of triangle ABC.
I believe, you are describing what is called a SOUND. The Puget Sound is located in the Pacific Northwest and touches such places as Seattle and Winslow.
The area covered by an enclosed figure
A paddock is an enclosed area for horses. Termites build mounds.