I'm concerned that the U.S. stocks have given the same signal three times in the past week. It seems that the Hindenburg Omen has been repeatedly triggered on the New York Stock Exchange. Despite a strong rebound last week, analysts are still cautious.

The Hindenburg Omen is an indicator proposed in 1995, and it tends to appear when the market hits a top. Essentially, it's a signal that occurs when individual stock movements become scattered at high price levels. There are four conditions: for example, the percentage of stocks updating their 52-week highs and lows both exceeding 2.2%, even though the 10-week moving average is rising, indicating conflicting market behavior.

In fact, the same pattern appeared early in 2022, and shortly afterward, a bear market began. Historically, the repeated occurrence of the Hindenburg Omen often signals an upcoming market correction. However, it's not foolproof—sometimes no significant event follows the signal. Still, U.S. stock investors should stay alert.