marriage point
n.— «For Mr. Rasche, the favorite part of the Bowling Green plant tour was the moment when the car’s assembled powertrain and chassis were pushed up into the sleek composite body from below—a step the auto industry calls the marriage point—and attached by a squad of workers.» —“Taking Delivery at the Plant to See Their Babies Born” by Stuart F. Brown New York Times Sept. 24, 2006. (source: Double-Tongued Dictionary)