Which is the symbol not associated with data flow diagrams?

Open-ended rectangle

Parallelogram

Square

Circle

DFD symbols are consistent notations that depict a system or a process.
It entails the use of short-text labels, arrows, circles and rectangles to describe data flow direction.
External entities are represented by squares as the source or destination of data.
Processes are represented by rectangles with rounded corners.
Data Flows are referred to by arrows to denote the physical or electronic flow of data.

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