A visual language is a ProgrammingLanguage that uses pictures to depict the instructions of a program
and their relations.

	* ControlFlowDiagram

Visual languages can also be used in ProgramUnderstanding to visualize some aspect of a program.
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I would think that an example of a Visual Language is UML or SDL;
I associate a control flow diagram more with SoftwareVisualization. 
-- ArieVanDeursen
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CategoryParadigm | Contributions by Main.EelcoVisser