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setting rule

British  

noun

  1. printing a metal strip used in the hand-setting of type in a composing stick to separate the line being set from the previous one

"Collins English Dictionary — Complete & Unabridged" 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

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Do you let the default setting rule your life?

From Time

Among the ingenious devices added are: the Rogers systems of setting rule and figure tables, box heads, etc.; the reversal of the line so as to set Hebrew characters in their proper relation; the production of printers' rules of any pattern; the making of ornamental borders; a device for the casting of the same line an indefinite number of times from one setting.

From Project Gutenberg