ASSEMBLY LINE
'(<a href="http://www.j-archive.com/media/2010-02-16_J_30.wmv">Alex reports from the line at the Ford Motor Company in Dearborn, MI.</a>)  To increase manufacturing efficiency, the engine will fit not only the truck here, but a whole variety of others, which makes it this kind of interchangeable part, from the Latin for "unit of measurement"'
modular