Bignums

 BIGNUMS [from Macsyma] n. 1. In backgammon, large numbers on the
       dice. 2. Multiple-precision (sometimes infinitely extendable) integers
       and, through analogy, any very large numbers. 3. EL CAMINO BIGNUM: El
       Camino Real, a street through the San Francisco peninsula that
       originally extended (and still appears in places) all the way to
       Mexico City. It was termed "El Camino Double Precision" when
       someone noted it was a very long street, and then "El Camino
       Bignum" when it was pointed out that it was hundreds of miles
       long.