A bullish signal just flashed amid the stock market chaos

A trader works on the floor of the New York Stock Exchange (NYSE) in New York, U.S., October 23, 2018.

REUTERS/Brendan McDermid

• A double bottom pattern may signal the end of the S&P 500's downtrend.
• The S&P 500 rebounded at the same level on Monday as it did on March 13.
• April's historical bullish trend and low trading volume could also signal an imminent recovery.

The stock market flashed a bullish technical signal as it climbed out of a hole in Monday's trading session.