In the marketing/preview leadup to system launch, Sony originally called it the PlayStation X (rumored to be short for PlayStation Experimental back when Sony was collaborating with Nintendo) so the magazines abbreviated it as PSX. It was the 90s, extraneous Xs were everywhere in popular culture at the time. Despite the fact that the X had been dropped from the PlayStation name by launch, gamers were already too used to calling it PSX by then thanks to the magazine and internet previews so the name stuck. It was a very early example of a meme taking on a life of its own.
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