For some reason I got completely distracted by creating an alphabet for the Slith. Probably because I had discovered the Elian Script and turned the Language Construction Kit on it. I didn't go full Abinar... I'll tell you about Abinar later. What I came up with is below. It uses the Elian script with a custom set of sounds and a probably not well thought out script for numbers.
They had four fingers on each hand and their numbering system was octal. The 0 in the alphabet above was used only when referring to the empty set.