You see these hands on doors all over France. I’ve seen them in other European countries as well. At first I thought maybe it represented the hand of Aphrodite holding an apple but I think I over-analyzed the whole thing. It’s just a hand to knock on the door for you. It’s always a feminine hand though. I’ve never seen a masculine thick hand on a door. This one has a ring too.
This one is pretty. Look at the decorative cuff at the top of the hand.
This knocker was on a door in a Corsican village. I love the peeling paint with the elegant hand in the middle.