System Analysis and Design
The four icons used in building Data Flow Diagram are

Flow, Source, Store, Process
Flow, Process, Source, Store
None of these
Flow, Process, Source/Destination, Store
Source, Process, Destination, Store

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System Analysis and Design
A couple:

means that the upper module has the capability of calling the lower module
None of these
is represented by a line joining two modules
None of these
is a data item that moves from one module to another

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System Analysis and Design
A square symbols

identifies data flow
is a data store-data at rest, or a temporary repository of data
defines a source or destination of system data
represents a process that transforms incoming data flow(s) into outgoing data flows
None of these

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