Hexonu is a weird, awkward, monospaced font family. In place of true lower case letters, it has an second set of capitals that, through the magic of the OpenType contextual alternatives (calt) feature, automatically alternates with the set on the upper-case keys. If one wants to use only one set of letters, the contextual alternatives must be turned off and character spacing adjusted.

Hexonu is another effort to create a font with alternating sets of letters (see PoultySign, Lentzers, and Caltic for others). The base shape for forming the letters is a lopsided hexagon that resembles an old coffin. In four of the six family members, the alternating shape is a distorted hour-glass. In the other two, coffin shapes heads up alternate with coffin shapes heads down. The family was created as an experiment with the calt feature and not for any particular use. It is does not work as text but its bizarreness makes it appropriate for some poster and signage applications.