abc algol

from The Free On-line Dictionary of Computing (8 July 2008)

ABC ALGOL

   <language> An extension of {ALGOL 60} with arbitrary data
   structures and user-defined operators, for {symbolic
   mathematics}.

   ["ABC ALGOL, A Portable Language for Formula Manipulation
   Systems", R.P. van de Riet, Amsterdam Math Centrum 1973].

   (1994-10-28)