The word hieroglyph comes from the Greek adjective ἱερογλυφικός (hieroglyphikos), a compound of ἱερός (hierós 'sacred') and γλύφω (glýphō '(Ι) carve, engrave'; see glyph).
The glyphs themselves,

 ...

Origin
Hieroglyphs may have emerged from the preliterate artistic traditions of Egypt. For example, symbols on Gerzeanpottery from c. 4000 BC have been

 ...

Knowledge of the hieroglyphs had been lost completely in the medieval period. Early attempts at decipherment are due to Dhul-Nun al-Misri and Ibn Wahshiyya (9th and 10th century, respectively).
All medieval and early modern attempts were hampered by the

 ...

Standard orthography—"correct" spelling—in Egyptian is much looser than in modern languages. In fact, one or several variants exist for almost every word. One finds:

 ...

• List of Egyptian hieroglyphs
• Egyptian language
• Middle Bronze Age alphabets

 ...

• Adkins, Lesley; Adkins, Roy (2000). The Keys of Egypt: The Obsession to Decipher Egyptian Hieroglyphs. HarperCollins Publishers. ISBN 978-0-06-019439-0.
• Allen, James P. (1999). Middle Egyptian: An Introduction to the Language and Culture of Hieroglyphs. Cambridge

 ...

Egyptian hieroglyphs were added to the Unicode Standard in October 2009 with the release of version 5.2 which introduced the Egyptian Hieroglyphs block (U+13000–U+1342F) with 1,071 defined characters.
As of July 2013 , four

 ...