A system is a regularly interacting or interdependent group of items forming a unified whole
Ergonomics is the science of designing and arranging objects, environments, and systems to optimize human well-being, comfort, safety, and performance.
A device is a single piece of hardware with a specific function, while a system is a more comprehensive arrangement of devices, software, and infrastructure working together to accomplish a broader goal. Devices are typically elements within a system, contributing to its functionality.