A diagram is a symbolic representation of information according to some visualization technique. Diagrams have been used since ancient times, but became more prevalent during the Enlightenment. Sometimes, the technique uses a three-dimensional visualization which is then projected onto a two-dimensional surface. The word graph is sometimes used as a synonym for diagram.

https://en.wikipedia.org/wiki/Diagram

"Better by far to embrace the hard truth than a reassuring fable."
Carl Sagan
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