ep·i·graph /ˈɛpəˌgræf/
  碑文,題銘,題辭
  Ep·i·graph n.
  1. Any inscription set upon a building; especially, one which has to do with the building itself, its founding or dedication.
  2. Literature A citation from some author, or a sentence framed for the purpose, placed at the beginning of a work or of its separate divisions; a motto.
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  epigraph
       n 1: a quotation at the beginning of some piece of writing
       2: an engraved inscription