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One of the bits of leather, cloth, etc. indicating a specified length of a lead line.

A charted conspicuous object, structure, or light serving as an indicator for guidance or warning of a craft; a beacon.

A definite object ,such as an imprinted metal disk, used to designate a survey point and sometimes refers to the entire survey monument. Mark is used with a qualifying term such as station, reference, azimuth, or bench. See also bench mark and reference mark.

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