Gerd Arntz was a German modernist who created over 500 icons, or isotypes, with the ambitious goal of clear communication to the illiterate masses, newly liberated by socialism. In collaboration with Otto Neurath, they strove ‘to overcome barriers of language and culture, and to be universally understood’ to facilitate the communist revolution. Not exactly my politics, but the man was a master semiotician.
They have a wonderfully curated collection over at the Gerd Arntz Web Archive.