x	10th century Cartesian coordinate system Christianity Christina Aguilera Square root The X-Files The X Factor (UK) X Window System X Window System core protocol X Window System protocols and architecture

x1	Linear equation

x11	X Window System

x11r4	X Window System

x11r5	X Window System

x11r6	X Window System

x11r7	X Window System

x3	ASCII

x4	Super Mario 64