Representing a door bolt used in double doors. The bulges in the center kept the bolt restrained between two fastening rings on one door; slid from one end to the other, it would pass through a third fastening ring on the other door and so lock it. When summarized, the bulges could be reduced to a pair of rounded dots. This glyph was conventionally colored red. The phonogrammatic value derives by the rebus principle from its use as a logogram for z(âdoor boltâ).
Gardiner, Alan (1957) Egyptian Grammar: Being an Introduction to the Study of Hieroglyphs, third edition, Oxford: Griffith Institute, âISBN, page 496
Henry George Fischer (1988) Ancient Egyptian Calligraphy: A Beginnerâs Guide to Writing Hieroglyphs, New York: Metropolitan Museum of Art, âISBN, page 12
Betrò, Maria Carmela (1995) Geroglifici: 580 Segni per Capire l'Antico Egitto, Milan: Arnoldo Mondadori Editore S.p.A., âISBN
Peust, Carsten (1999) Egyptian Phonology: An Introduction to the Phonology of a Dead Language[1], GĂśttingen: Peust und Gutschmidt Verlag GbR, page 48