Source : Free On-Line Dictionary of Computing

MPL
     
        1.  An early possible name for {PL/I}.
     
        [Sammet 1969, p.542].
     
        2. {MasPar} {data-parallel} version of {C}.  See also {ampl}.
     
        {Compiler version 3.1 (ftp://maspar.maspar.com/put/)}.
     
        3. Motorola Programming Language.  A low-level {PL/I}-like
        language, similar to {PL/M}, but for the {Motorola 6800}.
     
        4. MicroProgramming Language.  Simple language for
        microprogramming.  Statements on the same line represent
        {register} transfers caused by one microinstruction, and are
        executed in parallel.
     
        ["Structured Computer Organization", A.S. Tanenbaum, First
        Edition, P-H 1976. (Replaced in later editions by Mic-1)].
     
        (1995-03-07)