Histoface
Histoface is a histogram typeface designed for clandestine use in Photoshop's Levels adjustment palette.
The character shapes articulate the tight constraints of histogram imagery. Each figure must be constructed from bottom-flush vertical lines, rendering compound paths and concave cantilevers impossible.
Inspired by David Friedman's article The Histogram as the Image (Ironic Sans) and Josh Millard's response Retro-Histo: Making an image fit your histogram.