Essays / Starting Huckleberry Finn! [12]

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How do the symbols in The Adventures of Huckleberry Finn reveal theme?

I'm stuck on a thesis for an essay I have to write on The Adventures of Huckleberry Finn.

This is the thesis prompt:

Show how the author's use of symbolism reveals theme OR reinforces aspects of character.

If anyone could give suggestions of what three different symbols in the book are and how they reveal theme or reinforce aspects of character, that would be great.

Thanks