From the ReadMe:
“The Bissantz SparkFonts are a set of TrueType Fonts (TTF) made by Bissantz & Company to implement the great sparkline concept devised by Edward Tufte.
These fonts embody glyphs in the shape of bars, line segments, pies and other “building blocks” of statistical diagrams. Special software provided by Bissantz maps each value of the numerical
input data to a character which is formatted with an appropriate SparkFont. The concatenation of formatted characters results in a “textual image” of the sparkline. This way, one can work with the
sparkline just like with normal text.”