commemorative plaque
A commemorative plaque, or simply plaque, is a plate of metal, ceramic, stone, wood, or other material, typically attached to a wall, stone, or other vertical surface, and bearing text or an image in relief, or both, in memory of one or more persons, an event, a former use of the place, or some other thing. A monumental plaque or tablet commemorating a deceased person or persons, can be a simple form of church monument.