A number of symbols have been standardized for data flow diagrams to represent data flow, rather than control flow. These symbols may also be used in control flowcharts (e.g. to substitute for the parallelogram symbol).
A Document represented as a rectangle with a wavy base;
A Manual input represented by quadrilateral, with the top irregularly sloping up from left to right. An example would be to signify data-entry from a form;
A Manual operation represented by a trapezoid with the longest parallel side at the top, to represent an operation or adjustment to process that can only be made manually.
A Data File represented by a cylinder.