There's a medallion puzzle in the Resident Evil 2 demo where you will come across a piece of furniture with changeable icons. You can switch these symbols around, and the goal of this small puzzle is to get three correct symbols in the correct order. If you do this, you will get the lion medallion.
We won't bore with the all the details of this, but the winning order is Crown, Lion, and Ram. When you enter this combination, the shield will open up and you get access to the lion medallion, which will be useful later in the game.