stigonomancy

from The Collaborative International Dictionary of English v.0.48
Stigonomancy \Stig"o*no*man`cy\, n. [Gr. ?, ?, one who is
   marked, or one who marks (? to mark with a pointed
   instrument, to prick) + -mancy.]
   Divination by writing on the bark of a tree.
   [1913 Webster]
    

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