Printed Wiring Boards
When assembling an electronic circuit, a board is needed on which the components can be mounted and wired together. This board is called a Printed Wiring Board (PWB).
In Japan, the printed wiring board used to be called a "Printed Circuit Board." Nowadays in Japan the name "Printed Circuit Board" is not used because the initials of "Printed Circuit Board" are "PCB." PCB also stands for "Polychlorinated Biphenyls (PCBs)," which is a poison. So in Japan, we refer to the boards as "Printed Wiring Boards." In other countries, they are still refered to as "Printed Circuit Boards," or PCBs.