is not transliterated f as it would usually be, but appears to be functioning as an obscure determinative. Association with the common term jt.f is also likely.
James P[eter] Allen (2010) Middle Egyptian: An Introduction to the Language and Culture of Hieroglyphs, 2nd edition, Cambridge: Cambridge University Press, →ISBN, pages 261, 457.
^ Loprieno, Antonio (1995) Ancient Egyptian: A Linguistic Introduction, Cambridge: Cambridge University Press, →ISBN, pages 33, 36, 49, 59