Source : Free On-Line Dictionary of Computing

PL-11
     
         A high-level machine-oriented language for the
        {PDP-11} developed by R.D. Russell of CERN in Nov 1971.  It is
        similar to {PL360} and is written in {Fortran IV} and
        {cross-compile}d on other machines.
     
        (1995-01-05)