escutcheon
key plate, escutcheon, 1
1. A protective plate surrounding the keyhole of a door, a light switch, etc.; also called a scutcheon.
2. A flange on a pipe, used to cover a hole in a floor through which the pipe passes.
3. A protective or ornamental cover at the termination of a post, picket, or rail against a tread, floor, or wall.
McGraw-Hill Dictionary of Architecture and Construction. Copyright © 2003 by McGraw-Hill Companies, Inc.