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A Straightedge with markings to indicate distances. Although Geometric Constructions are sometimes said to be performed with a ruler and Compass, the term Straightedge is preferable to ruler since markings are not allowed by the classical Greek rules.
See also Coastline Paradox, Compass, Geometric Construction, Geometrography, Golomb Ruler, Perfect Ruler, Simplicity, Slide Rule, Straightedge