Source : Webster's Revised Unabridged Dictionary (1913)

Symbal \Sym"bal\, n.
   See {Cimbal}. [Obs.]

Source : Free On-Line Dictionary of Computing

SYMBAL
     
        SYMbolic ALgebra.  A {symbolic mathematics} language with
        {ALGOL}-like syntax by Max Engeli, late 60's.  Implemented for
        {CDC6600}.
     
        ["User's Manual for the Formula Manipulation Language SYMBAL",
        M. Engeli, TRM-8.00, Comp Ctr UT Austin, June 1968].