Source : Free On-Line Dictionary of Computing

LSL
     
        1. Larch Shared Language.  An assertion language.  (See
        Larch).
     
        2. Link and Selector Language.  Graphic query language.  "LSL:
        A Link and Selector Language", D.C. Tsichritzis, Proc Intl
        Conf Management of Data, ACM 1976, pp.123-134.