A decorative plate or shield, usually on a door, that covers the keyhole or the area around the handle.
Scuncheons are often fancy and make doors look nice.
Examples:
The shiny scuncheon on the door had a picture of a flower.
He touched the scuncheon and felt how cold it was.
The scuncheon with the lion on it was very old.
The scuncheon was so big, it looked like a small shield.
The scuncheon was made of gold and had many jewels on it.
I saw a scuncheon with a dragon on it, and it was very scary.