’His life’s ambition is to have his head cut off and stuck up on a plaque just like his mother,’ said Ron irritably.
He beckoned to Harry and led him out of Kingsley’s cubicle, through a second set of oak doors, into another passage, turned left, marched along another corridor, turned right into a dimly lit and distinctly shabby corridor, and finally reached a dead end, where a door on the left stood ajar, revealing a broom cupboard, and a door on the right bore a tarnished brass plaque reading: Misuse of Muggle Artefacts.
There are no more uses of "plaque" in the book.
Show samples from other sources
His scarcely revived memories couldn’t quite grasp what it meant, but he’d first seen it on the metal plaque back in the Maze, the one that had spelled out the words that made up WICKED’s acronym.
James Dashner -- The Scorch Trials
A plaque beside the door declared that the space was actually titled the Newsome Library, but I’d never heard anyone call it by that name except for Mom on occasion.