Google Fonts recently released two variable fonts that are not made for writing, but to render data. This comes very handy for graphic and web designers who want a quick way to render data without the need to draw the graphs. You can download both fonts from here.

Wavefont

Wavefont has a Weight, Round, and Vertical Alignment axes to render waveforms, spectrums, diagrams or bars. See the demo here.

Linefont

Linefont has a Weight and Width axes for rendering small to medium-scale line charts. See demo here.