XABY

XABY is a security code used in Chrono Trigger.

The Factory Ruins
While Crono and his party are inside the Factory in 2300 A.D., they come across an area that requires a security code to proceed. The code is acquired in the Factory area and used to proceed through the Lab area of the Factory to gain access to the device that restores power to Proto Dome.

The code is nicknamed "ZABIE", which translates to a spelling of XABY.

Behind the scenes
The code "XABY" corresponds to the X, A, B, and Y buttons on the Super Nintendo Entertainment System controller. When the player is prompted to enter the code, they push those buttons in that exact order.