钥匙孔盖
小盾片
孔罩

Scutcheon \Scutch"eon\, n. [Aphetic form of escutcheon.]
1. An escutcheon; an emblazoned shield. --Bacon.

The corpse lay in state, with all the pomp of
scutcheons, wax lights, black hangings, and mutes.
--Macaulay.

2. A small plate of metal, as the shield around a keyhole.
See {Escutcheon}, 4.