Sony used PS-X as the development codename for the original PlayStation before its 1994 launch.
The name reflected Sony’s early internal designation for its first independently developed video game console. The system emerged after Sony’s planned collaboration with Nintendo on a CD-ROM accessory ended, leading Sony to continue developing its own hardware.
The finished console was officially called PlayStation and launched in Japan on December 3, 1994. Its design emphasized CD-ROM software, 3D graphics, and a controller with four shoulder buttons, features that helped distinguish it from many cartridge-based competitors.
PS-X is sometimes confused with PSone, but the latter was the official name of the smaller 2000 redesign of the original PlayStation. It is also unrelated to the later Japanese PSX digital video recorder, which combined PlayStation 2 hardware with television-recording functions.