plumb rule

plumb rule

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

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 interrobang. Does it mean:
a printed punctuation mark (‽), available only in some typefaces, designed to combine the question mark (?) and the exclamation point (!), indicating a mixture of query and interjection, as after a rhetorical question.
an arrangement of five objects, as trees, in a square or rectangle, one at each corner and one in the middle.
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
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