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Sell walls are a relatively new phenomenon in public order book exchanges with the rise of cryptocurrency trading. They are always manipulative in nature, designed to scare traders and skew price perception by placing anomolously large sell order(s) at a single price point. This will be reflected in the order book as a seeming "wall".
A collateralized debt obligation (CDO) is a form of derivative in which the value is generated from another underlying asset, and is sold to institutional investors.