Final answer:
In a Data Flow Diagram, the data flow is represented by an arrow, which indicates the movement of data between entities in the system.
Step-by-step explanation:
The symbol in a Data Flow Diagram (DFD) that is usually portrayed with an arrow is called a data flow. In a DFD, an arrow represents the movement of data between processes, data stores, and external entities. To illustrate, if one were to draw a DFD for a system that includes international trade, arrows would be used to depict the transfer of goods and payments. An arrow from the foreign country to firms would represent imports, while an arrow in the reverse direction would show payments for imports. Similarly, an arrow from firms to the foreign country would illustrate exports, and a reverse arrow would denote payments received for them. These arrows help in visualizing the flow of data or goods within the depicted system, making it easier to understand and analyze.
The data flow diagram (DFD) symbol that is usually portrayed with an arrow is the dot with an arrow pointing right, labeled F, and an arrow pointing right, labeled f, that is of equal length or shorter than F. This symbol represents the flow of data from one process to another within the DFD.