LEM is the technical term of such mechanisms or engineering.
LEMs are a subset of compliant mechanisms fabricated from planar materials (lamina) and have motion emerging from the fabrication plane.
LEMs use compliance, or the deflection of flexible members to achieve motion.
[1] Ortho-Planar Mechanisms are an earlier concept similar to LEMs.
The research in LEMs also overlaps with deployable structures,[5] origami, kirigami, compliant mechanisms, microelectromechanical systems, packaging engineering,[6] robotics,[7] paper engineering, developable mechanisms, and more.