@attoparsec Years ago I helped a friend to prepare his PhD dissertation about communication, and I discovered that in 1838 the Chappe sent news from Paris to Toulouse (588 km) in 2,5 hours¹.The "language" had 98 symbols, 6 control codes and 92 "chars": combining them it was possible to have 8464 combinations².~~¹ https://commons.wikimedia.org/wiki/File:Depeche_telchappe.jpg² https://www.bbc.co.uk/news/magazine-22909590