Iconography of correlations

In exploratory data analysis, the iconography of correlations, or representation of correlations, is a data visualization technique which replaces a numeric correlation matrix by its graphical projection onto a diagram. Correlations between variables are represented by solid lines (positive correlations) or dotted lines (negative correlations) plotted on the diagram, where shorter lengths or thicker lines (or both) represent greater projection components and thus greater degree of correlation.

Source: Wikipedia — Iconography of correlations (CC BY-SA 4.0)