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1.                 From The Free On-line Dictionary of Computing (19 January 2023):
                   
   
   
                   
                     
   Systems Network Architecture
   Blue Glue
   SNA
      <networking> (SNA) IBM's proprietary high level networking
      protocol standard, used by IBM and IBM compatible
      mainframes.
      Also referred to as "Blue Glue", SNA is a bletcherous protocol
      once widely favoured at commercial shops.  The official IBM
      definition is "that which binds blue boxes together."  It may
      be relevant that Blue Glue is also a 3M product commonly
      used to hold down carpets in dinosaur pens.
      [Jargon File]
      (1994-11-23)