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

Rationalized C
RatC

    (RatC, after "RATFOR") A version of Ron Cain's
   original Small-C compiler.

   ["A Book on C", R.E. Berry and B.A. Meekings, 1984, ISBN
   0-333-36821-5].

   [In what way was it "rationalized"?]

   (1999-06-28)