Arrow annotation allows to add arrows to the chart, which can be used to display buy/sell signals or mark any other significant point. Arrow annotation allows to add this type of drawing to the chart, as any other annotation it can be drawn by user or hardcoded into a chart. In this article you can learn how to hardcode it and what visual settings can be applied.
To learn about basic settings please refer to Drawing Tools and Annotations: General Settings article.
To learn more about drawing process and its management please refer to Drawing Tools and Annotations: Drawing article.