matchmark

noun

a mark made on mating components of an engine, machine, etc, to ensure that the components are assembled in the correct relative positions

verb

(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