VI Icon
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The VI Icon is used to represent the function of the VI as a SubVI on the Block Diagram.
Best Practices
The icon you use to represent your subVI can tell you or other developers a lot about what the subVI does without ever having to open the subVI. Taking the time to create at least simple text VI icon is a requirement when sharing code between developers. The use of images in VI icons can also enhance their meaning when text can't be used because of length or in cases where code is shared across different spoken languages. National Instruments keeps an Icon Art Glossary to help developers who are less experienced making easy to recognize icons.
Editing the VI Icon
See Icon Editor.