Yes they were.
The Rosetta stone.
Hieroglyphics.
Hieroglyphics
Egyptians hieroglyphics are picture letters
The Rosetta Stone, discovered in 1799 near Alexandria in Northern Egypt, was the key that unlocked the secret of the hieroglyphics.
they are called called hieroglyphics.
hieroglyphics
Hieroglyphics were made to show a sound.https://discoveringegypt.com/egyptian-hieroglyphic-writing/egyptian-hieroglyphic-alphabet/
Jean-François Champollion used the Rosetta stone to decipher Egyptian hieroglyphics.
Today, hieroglyphics are only used as decorations, particularly to convey an Egyptian theme.
They are called Egyptian hieroglyphics in modern times. In ancient times, they were called "words of the gods"
The correct spelling is "hieroglyphics" (ancient Egyptian pictographs).