The Rule is similar to Murphy's Law, in that it states, that when you sell a stock, it immediately ticks waaaay UP after you sold it. Its also known as the NedSerious law. just kidding.
A former rule established by the SEC that requires that every short sale transaction be entered at a price that is higher than the price of the previous trade.
These thoughts are just mine, not right, not wrong, just thoughts. Invest in what you believe in, not what I believe in. Do your research, and invest in the facts.