According to Joe Ross, a Ross Hook is created by:
To put it in other words, a Ross Hook marks the beginning of a correction after a leg in the direction of the trend. When this correction begins, the price action trader is watching for its end and a buy (in an uptrend) or sell (in a downtrend) set up. The trend resumes when the price breaks the Ross Hook. Price action trading is actually that simple - you wait for a pull back during a trend and enter in the direction of the trend.
The Ross Hooks look like follows: