PlayStation at first was called PSX.
"In 2000, a redesigned, slim version called the PS one was released, replacing the original grey console and named appropriately to avoid confusion with its successor, the PlayStation."
Regardless of later revisions or whatever though, WTF was it called the PSX for? Why not just abbreviate it to PS, where does the x come from?
I know it was called PSX, I remember gaming magazines would use that as its initials for what platforms games would release on or whatever else, I'm just curious why they randomly decided to add an x