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

  big iron
   n.
  
      [common] Large, expensive, ultra-fast computers. Used generally of {
      number-crunching supercomputers, but can include more conventional big
      commercial IBMish mainframes. Term of approval; compare heavy metal,
      oppose dinosaur.
  

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

  big iron
  heavy metal
  
      (Or "heavy metal [Cambridge]) Large, expensive,
     ultra-fast computers.  Used generally of number crunching
     supercomputers such as Crays, but can include more
     conventional big commercial IBMish mainframes.  The term
     implies approval, in contrast to "{dinosaur".
  
     [{Jargon File]
  
     (2000-11-09)
  

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