Many investors are familiar with the yield curve. And they know looking at consumer confidence and unemployment trends can often give a sense of where the stock market is headed.

There are some indicators that don't receive as much attention from investors. Some are wacky, such as predicting what the stock market will do based on the Super Bowl winner. Others, though, might seem odd but actually make sense.

One such unusual market indicator is flashing a serious warning signal for stocks right now.

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Source Fool.com