50-day MA moved above the 200-day MA: Definition: Stocks that had the simple moving average of the last 50 closing prices move above the simple moving average of the last 200 closing prices.
Interpretation: Typically, the 50-day MA crosses the 200-day MA soon after a stock has turned around and started moving higher after a multi-month downtrend. Many longer-term value investors consider this kind of crossover to be "the last chance" to get in on a stock that should perform well in the mid-to-long term.
There are also a silver cross 50 ma to 100 ma and a platinum cross 100ma to 200 ma. I believe