In the story I'm working on, I have a character that interacts with a voice in his head. While I've been writing the story I wanted a visible cue to differentiate the speaker so I adopted wrapping words from the voice with asterisks and then when my character speaks to the entity I began using two asterisks.
I realize it's unusual, but it made sense to me at the time.
I'll try to demonstrate it here in a quote block in the hopes that it wont get mangled by markup or markdown or whatever.
Bob is walking down the street.
*Hey buddy can you hear me?*
Bob looks around nervously and says, "Who's that? Where are you?"
*Call me Jack, and you don't need to speak out loud, just think back to me.*
Bob is doubtful, but tries it anyway.
**Can you hear this?**
*Yes, thanks for answering me. You wouldn't believe how often the people I speak to just run away screaming.*
Bob gives that some thought and replies, **Well Jack, I guess I can understand that**
Looking at the "Text Formatting Guide" this isn't going to work as-is for me to upload the story. So I'm looking for suggestions on a better way to handle the idea.