al·lo·graph /ˈæləˌgræf/
  代書,代理簽名,異形文字
  Al·lo·graph n.  A writing or signature made by some person other than any of the parties thereto; -- opposed to autograph.
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  allograph
       n 1: a variant form of a grapheme as `m' or `M'
       2: a signature made by one person for another