This charming script is described in an appendix to Ursula Le Guin’s scifi/ethnographic novel Always Coming Home of 1985. It was used for the language of the Kesh, a race of humans living on Earth in the distant future.
A script for the Kesh language
This chart of letters is adapted from Mattias Persson’s, which was in turn adapted from a chart by AnonMoos. The /z/ suffix is used morphemically.