From The Free On-line Dictionary of Computing (19 January 2023):
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)