A ruler, sometimes called a rule or line gauge, is an instrument used in geometry, technical drawing, printing, engineering and building to measure distances or to rule straight lines. The ruler is a straightedge which may also contain calibrated lines to measure distances.

https://en.wikipedia.org/wiki/Ruler

"As a professor of science, I assure you we did, in fact, evolve from filthy monkey-men."
Professor Farnsworth
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