I think it's bivalvular
A bivalve. A clam (A brachiopod)
This is from Wikipedia:Bivalves have a shell consisting of two asymmetrically rounded halves called valves that are mirror images of each other, joined at one edge by a flexible ligament called the hinge.
The hinge ligament is a flexible structure that connects the two halves (valves) of a clam shell at the hinge. It acts as a spring to allow the shell to open and close. When the adductor muscles relax, the hinge ligament helps the clam's shell to open.
By design, the 3DS' hinge should be slightly loose. This is to prevent the hinge from breaking if the system is dropped or shaken violently. (A tight hinge would break easier.) The hinge shouldn't be so loose that the top screen comes out of its locked position under normal use. If this happens the system should be sent to Nintendo for repair. As well, the left side of the hinge will be slightly more loose than the right. This is because extra space was needed for wiring that travels through the hinge between the top and bottom halves.
A clamshell is a one-piece container consisting of two halves joined by a hinge area which allows the structure to come together to close. Clamshells are often made of a shaped plastic material, in a way that is similar to a blister pack. The name of the clamshell is taken from the shell of a clam, which it resembles both in form and function.
Nearly every store. Clamshell containers can be made in a variety of plastics such as polystyrene, polyester, PVC, foam sheets, etc, It is a one piece container consisting of two halves joined by a hinge area which allows the structure to come together to close. They can hold fruit, screws, fast food, and so many other items.
Some stoves are referred to as clam shells because they resemble the form and function of the shells of a clam. They are compact with hinge joining two halves.
The radius and ulna are joined by a syndesmosis along the lengths of their shafts. The distal radioulnar joint is not a syndesmosis.
door hinges attached to door and hinge post
Hindge joint
To fix a door hinge that is not working properly, you can try tightening the screws on the hinge, lubricating the hinge with oil or WD-40, or replacing the hinge if it is damaged.