The Free On-line Dictionary of Computing (30 December 2018):

Tbl

   1. A language by M.E. Lesk for formatting tables, implemented
   as a preprocessor to nroff.

   (1994-11-01)

   2. Table Building Language.  A simple language by Robert
   Freiburghouse of MIT which combines user-defined actions
   into an abstract machine.  It can be used to build
   table-driven predictive parsers and code generators in the
   MULTICS Fortran compiler and several PL/I compilers,
   including VAX-11 PL/I.

   ["Engineering A Compiler: VAX-11 Code Generation and
   Optimisation", P. Anklam et al, Digital Press 1977].

   (1994-11-01)