copiale cipher is a secret code that was used a long time ago to keep messages hidden. It looks like strange, squiggly lines and shapes and looks like it makes no sense. But it actually does - it's a special way of writing words and sentences, so that nobody can read them without the code. To read copiale cipher, you have to know the key, which is like a secret code, kind of like a math equation, that you have to use to unscramble the message and read it.