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

Lincoln Reckoner

   An interactive mathematics program including matrix
   operations, written about 1965.  It ran on the TX-2.

   ["The Lincoln Reckonere: An Operation-Oriented On-line
   Facility with Distributed Control", A.N. Stowe et al, Proc
   FJCC 29 (1966)].

   [Sammet 1969, pp. 245-247].