Definition of Poka-Yoke:
Japanese term which means mistake proofing.
A poka-yoke device is one that prevents incorrect parts from being made or assembled, or easily identifies a flaw or error.
A means of providing a visual or other signal to indicate a characteristic state. Often referred to as “error-proofing,” poka-yoke is actually the first step in truly error-proofing a system. Error-proofing is a manufacturing technique of preventing errors by designing the manufacturing process, equipment, and tools so that an operation literally cannot be performed incorrectly.
To avoid (yokeru) inadvertent errors (poka).