SDL Diagram Symbols

Pre-drawn SDL symbols represent N-type start, X-type start, Decision, etc. These symbols help create accurate diagrams and documentation.

SDL diagrams templates provides you many special shapes, including start, variable start, procedure, variable procedure, create request, alternative, return, decision, message from user, message to user, primitive to call, save, document, etc. All these shapes will surely help you draw the SDL diagrams you like.

SDL Diagram Symbols

SDL Diagram Shapes

SDL Diagram Symbols


Start tells you where the chart begins.


Procedure is an established or official way of doing something.

Disk storage

Disk storage is a general category of storage mechanisms where data are recorded by various electronic, magnetic, optical, or mechanical changes to a surface layer of one or more rotating disks.


Terminator is a device attached to the end-points of a bus network or daisy-chain.

On-page reference

On-page reference indicates that the next or previous step is somewhere else on the flowchart. It is particularly useful for large flowcharts.

Off-page reference

Off-page reference provides a visual cue that your diagram continues, adds a link, and gives you the option of adding text that matches the text on the destination page.

SDL Symbols 2

Chevron arrow is a V-shaped arrow.

SDL Symbols 3

Arrows show what's called "flow of control" in computer science. An arrow coming from one symbol and ending at another symbol signifies flow passes to the symbol the arrow points to.

Need fresh looking SDL diagram symbols for your design? These SDL diagram symbols are a cinch to pop in. And their crisp, fine detail will make spectacular, easy-to-understand diagrams and presentations to your customers.

You can have more symbols on the following pages:

SDL Diagrams

SDL Examples

3D Directional Map Symbols

Floor Plan Symbols

Process Flow Diagram Symbols

Process and Instrumentation Drawing Symbols

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