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Shaunodon said:
VAMatt said:
Why can't the abbreviation just be XSX?

Because that'll ignore half the systems. We're talking about two extra keystrokes to type XSX|S. Or even XSX/S, if you really can't find the | key.

How does is ignore half of the systems? The abbreviation can be anything we want it to be.  Could just as well be XB4.  The problem there is that it might confuse people.  XSX is pretty obvious.  

Most abbreviations are 3 characters, with some going to 4.  And, with abbreviations, shorter is better.