I've always wondered about the hidden convergence of the "9" in Plan 9, and the "IX" in Unix. IX, after all, is how Romans and Western Civilization wrote numbers until say 1200CE.
Given how smart Pike, Thompson, Ritchie etc are and we're, I doubt this is a coincidence!
Given how smart Pike, Thompson, Ritchie etc are and we're, I doubt this is a coincidence!