Who worked out what each symbol meant in hieroglyphics?

The deciphering of Egyptian hieroglyphics was primarily achieved by Jean-François Champollion in the early 19th century. He utilized the Rosetta Stone, which contained inscriptions in Greek, Demotic, and hieroglyphics, to unlock the meanings of the symbols. Champollion's understanding of Coptic, the descendant of ancient Egyptian, also aided in his breakthrough, allowing him to correlate the symbols with their phonetic sounds and meanings.