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2 definitions found
 for line noise
From The Jargon File (version 4.4.7, 29 Dec 2003) :

  line noise
   n.
  
      1. [techspeak] Spurious characters due to electrical noise in a
      communications link, especially an RS-232 serial connection. Line noise may
      be induced by poor connections, interference or crosstalk from other
      circuits, electrical storms, cosmic rays, or (notionally) birds crapping
      on the phone wires.
  
      2. Any chunk of data in a file or elsewhere that looks like the results of
      line noise in sense 1.
  
      3. Text that is theoretically a readable text or program source but employs
      syntax so bizarre that it looks like line noise in senses 1 or 2. Yes,
      there are languages this ugly. The canonical example is TECO; it is often
      claimed that ?TECO's input syntax is indistinguishable from line noise.?
      Other non-{WYSIWYG editors, such as Multics qed and Unix ed, in the hands
      of a real hacker, also qualify easily, as do deliberately obfuscated
      languages such as INTERCAL.
  

From The Free On-line Dictionary of Computing (30 December 2018) :

  line noise
  
      1. Spurious characters due to electrical
     noise in a communications link, especially an EIA-232
     serial connection.  Line noise may be induced by poor
     connections, interference or crosstalk from other circuits,
     electrical storms, cosmic rays, or (notionally) birds
     crapping on the phone wires.
  
     2. Any chunk of data in a file or elsewhere that looks like
     the results of electrical line noise.
  
     3. Text that is theoretically a readable text or program
     source but employs syntax so bizarre that it looks like line
     noise.  Yes, there are languages this ugly.  The canonical
     example is TECO, whose input syntax is often said to be
     indistinguishable from line noise.  Other non-{WYSIWYG
     Multics+"{qed">editors, such as Multics "{qed" and Unix "{ed}", in the
     hands of a real hacker, also qualify easily, as do
     deliberately obfuscated languages such as INTERCAL.
  
     [{Jargon File]
  
     (1994-12-22)
  

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