The name hieroglyphic (from the Greek word for “sacred carving”) is first encountered in the writings of Diodorus Siculus (1st c. BC). Earlier, other Greeks had spoken of sacred signs when referring to Egyptian writing. Among the Egyptian scripts, the Greeks labeled as hieroglyphic the script that they found on temple walls and public monuments, in which the characters were pictures sculpted in stone. The Greeks distinguished this script from two other forms of Egyptian writing that were written with ink on papyrus or on other smooth surfaces. These were known as the hieratic, which was still employed during the time of the ancient Greeks for religious texts, and the demotic, the cursive script used for ordinary documents.
Resources for Learning Hieroglyphs
Grammar Lessons by the Alexandrian Library.