PSX

Its new U.S. stock market, PSX, is drawing traders with more than 50 million shares changing hands daily, according to Mr. Greifeld, and the exchange is achieving its goal of drawing larger stock orders.

Nasdaq Profit Jumps 68%, Revenue Up Nathan Becker 2010

As others have mentioned, the PSX was the start of the ‘graphics before gameplay’ releases.

EXTRALIFE – By Scott Johnson - The SNES is the greatest console of all time? 2008

Sony PSX: The PSX is a sort of prelude to the PS3.

Telegraph.co.uk: news, business, sport, the Daily Telegraph newspaper, Sunday Telegraph 2010

Sony actually made a PlayStation called the PSX that they sold in Japan.

G4 TV - TheFeed 2009

Sony's restructuring is expected to focus on such key product categories as flat TVs, DVD recorders, home servers and the PSX, which is heralded as a bridge between the PlayStation2 game console and A/V equipment.

TWICE - Digital Imaging News 2009

Received SEC approval for NASDAQ OMX PSX "PSX", the first U.S. equity trading platform with a price-size priority model.

NASDAQ OMX Reports Solid Third Quarter 2010 Results - Yahoo! Finance 2010

They're a lot easier to swap out while on the road, they allow for more content than you can easily fit on a memory stick (which I tend to fill with ripped PSX games), and I want to avoid DRM'd downloadable games as much as possible.

Divestiture SVGL 2009

PSX-Scene, a Playstation community, had the pdf files of the documents first.

Court approves Sony's restraining order against George Hotz Hayley Tsukayama 2011

In short, I revealed my love of the Tool album Lateralus but that whenever I play it, I long to play Digimon World (PSX).

Gaming Soundtracks (and not the kind you’re thinking!) Ben Abraham 2009

It's ironic that these days, that description works more for Sony than Nintendo (especially since Sony were the ones who started to push gaming to a larger market with the original PSX).

What Can Nintendo Say That Will Impress You? SVGL 2009