Mnn.... not quite like a password or a set of rules. But a language within a language.

Imagine if I wanted to send a message to you in secret, but I knew other people might see that message, by sending it in a code only you and I understand, no one else would think anything of the message while you actually understand what I really intended.

Take for example if I asked you in a message: "How is my garden, Clementine? I'm worried about the marigolds and the lady bells. Would you check on them, for me?"

Now, what else might that mean?