#marker.artifact  some conspicuous object used to distinguish or mark something; "the buoys were markers for the channel"
  supertype:  #artifact__artefact  a man-made object taken as a whole
  subtype:  #bookmark__bookmarker  a marker (a piece of paper or ribbon) placed between the pages of a book to mark the reader's place
  subtype:  #yard_marker  (football) a marker indicating the yardline

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