BATS:IWM ISHARES RUSSELL 2000 ETF
come in three flavors: external, Internal, and curved. External do not cut through prices, but rest along the tops or bottoms of the peaks or valleys. Internal do cut through prices, so that is what differentiates an internal from an external one. Sometimes price action is not straight, but curved. Draw a curved along the peaks or valleys to identify this curved . I read this very recently from a book called, Getting Started in Chart Patterns by Thomas N. Bulkowski. I hope Tradeview community found this valuable to learn.