The indicator is created by the book of Larry Williams "Long-term secrets to short-term trading". But instead of identifying a trend by reversal points, there is added the trend Moving Average located on the zero line to define the direction of deals. For clarity the indicator is replaced to a separate window and the price is normalized by the trend MA. The meaning is in the following:

• МА trend is calculated and also МА drawn on high prices and МА drawn on low prices (the last two with a period of 3)
  
• trade only in the trend direction
• buy on МА drawn on low prices, close on МА drawn on high prices, sell on МА drawn on high prices, close on МА drawn on low prices.

Recommendations:

• Buy on the Moving Average price (Low), but only if the trend MA (on zero line) is blue (Up Trend).
• Close a buy on the Moving Average price (High).
  
• Sell on the Moving Average price (High), but only if the trend MA (on zero line) is orange (Down Trend).
• Close a sell on the Moving Average price (Low).