What are the visual methods used for representing the stock market different from the classic ones (lines, candles, etc.)?

I am a student of Engineering from the Politecnico di Torino and I am writing a final paper about data visualization applied to the stock market. Till now I have noticed that the main methods used are lines, candles, areas, and bars. Consequently, I would be interested in any multi-dimensional or "exotic" tool used for stock representation.

Thanks a lot in advance.