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

"Good judgement seeks balance and progress. Lack of it eventually finds imbalance and frustration."
President Eisenhower
0 online
Chat