Never hear of it, but TA is a new thing to me so am learning. Will have to learn more about this, but the little I have seen could be on any short/long crossover so depending on the view and timeframe of your trade this could mean alot or nothing at all.
its a bullish trend reversal for the long term, like over the next year.. and its not my theory, i just heard about it on Bloomberg because the mentioned that many technical analysis traders look at this and 200day sma for trend reversal..
To Trade Student - if you look at PPC's chart you will observe that the share price started dropping after these averages crossed and has been moing down ever since. As is common knowledge - do not only use one indicator!