matchmark

noun
  1. a mark made on mating components of an engine, machine, etc, to ensure that the components are assembled in the correct relative positions
verb
  1. (tr) to stamp (an object) with matchmarks
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