pl/seq

from The Free On-line Dictionary of Computing (8 July 2008)

PL/Seq

   Programming Language for Sequences.  A DSP language.  "A
   General High Level Language for Signal Processors", J. Skytta
   & O. Hyvarinen, Digital Signal Processing 84, Proc Intl Conf,
   Fiorence, Italy, Sep 1984, pp.217-221.