Before it launched the console was code named PlayStation X. The gaming media called it PSX, and even though the X was dropped the name stuck, especially online, where people would rather say PSX than spell out "PlayStation." The 90s were big on abbreviations (LMAO, for instance, and GCN for GameCube).
There was also no PS2 yet, so it wasn't called PS1 until PS2 started coming out.
In 2003 there was a PS2/DVR machine released that was actually named PSX, which was intentionally named after the nickname given to the PS1.
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