![Floor plan](https://cdn.statically.io/img/static.wikia.nocookie.net/memoryalpha/images/9/93/Floor_plan.jpg/revision/latest/scale-to-width-down/180?cb=20170921132503&path-prefix=en)
Mercy Hospital's floor plan (right)
A floor plan was a map of the interior of a building.
In 1986, one of the police officers guarding the operating room where Pavel Chekov was being cared for stood in front of a copy of Mercy Hospital's floor plan posted on the wall. (Star Trek IV: The Voyage Home)