plumb rule

noun

a device for determining perpendicularity, consisting of a narrow board with a plumb line and bob suspended from an upper edge.

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Origin:
1350–1400; Middle English plomreule

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Based on the Random House Dictionary, © Random House, Inc. 2012.
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Plumb rule is always a great word to know.

So is quincunx. Does it mean:

a fool or simpleton; ninny.

an arrangement of five objects, as trees, in a square or rectangle, one at each corner and one in the middle.

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Collins

World English Dictionary

plumb rule

—n
	a plumb line attached to a narrow board, used by builders, surveyors, etc

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Matching Quote

"Now, since our condition accommodates things to itself, and transforms them according to itself, we no longer know things in their reality; for nothing comes to us that is not altered and falsified by our Senses. When the compass, the square, and the rule are untrue, all the calculations drawn from them, all the buildings erected by their measure, are of necessity also defective and out of plumb. The uncertainty of our senses renders uncertain everything that they produce."

-Michel de Montaigne