Bit of a cheat today, as I didn’t have time for hunting down anything sematographic (‘With reference to Ancient Greek: of or relating to the use of signs or symbols (rather than letters) in writing’, OED), which is a great shame as this should have been just up my street. However, I did find a book, with some spanish sort-of sematographic pix, and an ancient Greek, so a combo of the two could just about cover it.
Day #177 of a 365 project, where the daily pic is informed by the OED word of the day.