Drawing Tools can be applied, moved, and formatted, directly on a chart, providing tremendous flexibility. Many drawing tools allow you to analyze new data on a chart by extending the drawing object to the left or to the right of the chart. You can use them to call attention to any area of a chart you wish.
This tool can be represented as a straight line extended to the right with constant incline angle, thus indicating the possible future trend direction.
Usually, tarders draw several Ray Lines on a chart as time progresses in order to track market movements.