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Thread: Why is is PAX not PAS?
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Old Dec 16, 2014 | 3:16 pm
  #31  
nachosdelux
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The telegraph is the origin of using an "X" to abbreviate or represent a bunch of following letters.

Other examples:

WX - weather
MX - maintenance
TX - transmit
RX - receive
DX - dispatch(er)
SEX - oh, nevermind.
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