Source : Free On-Line Dictionary of Computing

TPL
     
        1. Table Producing Language.  "The Bureau of Labor Statistics
        Table Producing Language (TPL)", R.C. Mendelssohn, Proc ACM
        Annual Conf (1974).
     
        2. Fleming Nielson.  A concurrent {functional language}.
     
        3. Terminal Programming Language.  Texas Inst, late 70's.
        Used on the TI-990/1 Small Business Computer and the TI-771
        Intelligent Terminal.