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reference mark

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noun
  1. Surveying. a permanent mark set at a specific distance in a specific direction from a survey station so as to permit accurate reestablishment of the station.
  2. any of various written or printed symbols, as an asterisk (*), dagger (†), or superscript number, used to indicate the presence of further information in a footnote, bibliography, or other text.

Origin of reference mark

First recorded in 1855–60
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018