A Data Store/File/Database may represent one of many different physical data; for example, a file folder, one or more computer-based file(s), or a notebook. A Data Store/File/Database symbol notation by Ed Yourdon-Peter Coad and Yourdon-DeMarco use parallel lines, while A Data Store/File/Database symbol notation by Chris Gane and Trish Sarson use an open-ended rectangle.
A Process/Function is the work or actions performed on data so that they are transformed, stored, or distributed. A Process/Function symbol notation by Ed Yourdon-Peter Coad and Yourdon-DeMarco use circles for processes, while A Process/Function symbol notation by Chris Gane and Trish Sarson use rectangles with rounded corners, sometimes called lozenges.
A Source/Sink or Input/Output is the origin and/or destination of the data. Sources/sinks are sometimes referred to as external entities because they are outside the system. A Source/Sink or Input/Output symbol notation use rectangle/square/box.
A Data Flow/Flow can be best understood as data in motion, moving from one place in a system to another. A Data Flow symbol notation use arrow line.
Bibliography
https://en.wikipedia.org/
https://www.lucidchart.com/
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