Escutcheon (noun)

1. A metal or wooden shield or emblem used as an architectural or decorative device, especially to display a coat of arms.
2. A metal or wooden plate or shield used to protect a keyhole or other mechanism on a door, window, or cabinet.

Origin:

Derived from the old french 'escuchon' meaning 'a small shield', from the latin 'scutum' meaning 'shield'.

Examples:

1. The escutcheon on the door of the castle displayed the coat of arms of the ruling family.
2. The escutcheon on the antique writing desk was intricately carved and gilded.
3. The escutcheon on the lock was designed to prevent the key from scratching the door.
4. The escutcheon on the fireplace was a beautiful ornate piece of metalwork.
5. The escutcheon was one of the key features that distinguished the medieval armor of a knight.