hieroglyphic

1. (chiefly in the plural) A writing system of ancient Egypt, Minoans, Maya and other civilizations, using pictorial symbols to represent individual sounds, often as a rebus.in-plural

2. (by extension) Undecipherable handwriting or secret symbol.Examples: "Above all, the 48-page timetables of the new service, which have been distributed free at every station in the scheme, are a model to the rest of B.R. For the first time on British Railways, so far as we are aware, a substantial timetable has been produced, not only without a single footnote but also devoid of all wearisome asterisks, stars, letter suffixes and other hieroglyphics."broadly