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register mark

British  

noun

  1. printing any of several marks incorporated on to printing plates to assist in the accurate positioning of images during printing

"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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The other kinds of marks, including the effektensperrmark, kreditsperrmark, and register mark, which Germany has created by amazingly complex categories of exchange restriction also bobbed up and down sharply.

From Time Magazine Archive