Region Switch
A Region Switch is a hardware modification to the Gamecube using an on/off switch to bypass regional lockout protection and change native language support on Gamecube hardware versions NTSC-U (USA) and NTSC-J (JAPAN).
These Gamecube versions use the same IPL (Gamecube "BIOS") which offers support for both English and Japanese languages, but not at the same time. A Region Switch can be set to the on or off position to enable the feature for playing import USA or Japanese original Gamecube titles, respectively.