Bell of Courage
Like the Book of Truth and the Candle of Love, the Bell of Courage is a physical object that somehow embodies the Principle it stands for.
The Bell has been seen in-game. The attacks of the foul Minax broke it somehow, and it had to be repaired using Blackrock.
For more, see BNN: The Principle Pieces - Part I.
On most Shards, the Bell played a role in the Warriors of Destiny event cycle. For the most part, this role involved the players seeking to secure it in some way from the Shadowlords or Casca.