Source : Free On-Line Dictionary of Computing

Flynn's taxonomy
     
         A classification of computer architectures
        based on the number of streams of instructions and data:
     
        {Single instruction/single data} stream (SISD) - a sequential
        computer.
     
        Multiple instruction/single data stream (MISD) - unusual.
     
        {Single instruction/multiple data} streams (SIMD) - e.g. an
        {array processor}.
     
        {Multiple instruction/multiple data} streams (MIMD) - multiple
        autonomous processors simultaneously executing different
        instructions on different data.
     
        [Flynn, M. J., "Some Computer Organizations and Their
        Effectiveness", IEEE Transactions on Computing C-21, No. 9,
        Sep 1972, pp 948-960].
     
        ["A Survey of Parallel Computer Architectures", Duncan, Ralph,
        IEEE Computer, Feb 1990, pp 5-16].
     
        (2003-05-29)