In the flow chart, some frames are usually used to represent various types of operations. Each step is written in the box, and then they are connected by lines with arrows to indicate the order of execution. The algorithm is represented by graphics, which is intuitive and easy to understand. Common standard flowchart symbols. Each symbol is vector and can be filled with color, changed in size, defined data, and connected. 1. Start and end marks: ellipse, 2. Process (or activity) mark: rectangle, 3. Decision (or decision) mark: diamond, 4. Connecting line (or streamline) mark: arrow, 5. Document mark, 6. Connection mark: circle, 7. Data mark: parallelogram, 8. Predefined process, 9. Prepared mark: Hexagon, 10 Symbol of parallel mode: a pair of parallel lines.