This pattern is comprised of three component parts:
1. After a long trends, the price rises to a peak and subsequently declines to form a trough.
2. The price rises again to form a second high substantially above the initial peak and declines again.
3. The price rises a third time, but only to the level of the first peak, before declining once more.
The first and third peaks are shoulders, and the second peak forms the head. The line connecting the first and second troughs is called the neckline.