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 for Open Systems Interconnection
From The Free On-line Dictionary of Computing (30 December 2018) :

  Open Systems Interconnection
  ISO seven layer model
  Open Systems Interconnect
  OSI Model
  OSI Reference Model
  OSI seven layer model
  seven layer model
      (OSI-RM, OSI Reference Model, seven layer model)
     A model of network architecture and a suite of protocols (a
     protocol stack) to implement it, developed by ISO in 1978
     as a framework for international standards in heterogeneous
     computer network architecture.
     The OSI architecture is split between seven layers, from
     lowest to highest: 1 physical layer, 2 data link layer, 3
     network layer, 4 transport layer, 5 session layer, 6
     presentation layer, 7 application layer.
     Each layer uses the layer immediately below it and provides a
     service to the layer above.  In some implementations a layer
     may itself be composed of sub-layers.
     OSI is the umbrella name for a series of non-proprietary
     protocols and specifications, comprising, among others, the
     OSI Reference Model, ASN.1 ({Abstract Syntax Notation 1), BER
     ({Basic Encoding Rules), CMIP and CMIS (Common Management
     Information Protocol and Services), X.400 (Message Handling
     System, or MHS), X.500 (Directory Service), Z39.50 (search
     and retrieval protocol used by WAIS), and many others.
     Apart from its actual application to real protocols, it also
     serves as a useful teaching model.

Contact=webmaster@dict.org Specification=RFC 2229