augrim stones

from The Collaborative International Dictionary of English v.0.48

Augrim \Au"grim\, n.
   See {Algorism}. [Obs.] --Chaucer.
   [1913 Webster]

   {Augrim stones}, pebbles formerly used in numeration.

   {Noumbres of Augrim}, Arabic numerals. --Chaucer.
      [1913 Webster]