The S&P 500 <.SPX> triggered a key technical signal called a death cross on Thursday that could mean more negative moves ahead.
The benchmark's 50-day moving average dipped below its 200-day average in what technical analysts consider a sign that short-term momentum has turned more negative than long-term momentum and could show the current downtrend is pervasive. Both moving averages are currently heading lower.
For a graphic see http://r.reuters.com/wyp23s
The benchmark's 50-day average had last been below its 200-day average in mid October.