A 9-sided polygon. The latin root orginates from the word "nona" which means ninth of the ninth. 9-9 or 1/9. Or just ninth. Read the book Virtual Mode by Piers Anthony for more relative relations on the modes and Julia set.
The nonagon has 20 parallel demensions. One is the Burgess set. I don't know any others. They are intersecting, but still parallel. Just fuck me, my brain hurts.