The head and shoulders pattern is a failed breakout of the left shoulder on the chart (see below). The lower high from the head to right shoulder confirms that the uptrend is dying. It usually, but not always, shows a pending reversal of the recent trend. There are a variety of signals that must confirm this action. You can read more about the head and shoulders chart pattern at Investopedia.
It is something to keep an eye on.... If I saw that $SPY broke below the 50d again, imo it could be a risky entry point w/ stops and/or hedgies to play a break down below the 200d and neck. No recommendation. Watch out for the SPY botz. What if the head and shoulders pattern turns into a crowded technical strategy and becomes contrarian???
S&P 500 Potential Head & Shoulders Set Up (Stockcharts.com)
S&P 500 Potential Inverted Head & Shoulders Pattern (Stockcharts.com)







