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In the Egyptian language, the night hieroglyph is used as a determinative for words relating to 'obscurity'. In the language it is used for grh-(grḥ), and w(kh)-(uḫ) for night, and kkw-(kku) for dark, and a determinative for other related words.
- Betrò, 1995. Hieroglyphics: The Writings of Ancient Egypt, Sky, p. 150.