(SNA) IBM' s proprietary high level networking protocolstandard, 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)