The Ancient Egyptian Swallow hieroglyph is Gardiner sign listed no. G36 for swallow birds. The Sparrow hieroglyph appears similar in size and shape, but it is used to represent small, or bad items.
The swallow hieroglyph is used in Egyptian hieroglyphs as a phonogram or biliteralBetrò, 1995. Hieroglyphics: The Writings of Ancient Egypt, synoptic profile only: Swallow or other member of the Hirundidae [sic] family, p. 130. for wr-(or ur), and means items that are "great". It might be considered an equivalent to the cuneiform: gal, GAL, also meaning 'great'. The swallow hieroglyph is also an ideogram for the swallow birds.
See also Gardiner's Sign List#G. Birds
References
Betrò, 1995. Hieroglyphics: The Writings of Ancient Egypt, Betrò, Maria Carmela, c. 1995, 1996-(English), Abbeville Press Publishers, New York, London, Paris (hardcover, ) Budge. The Rosetta Stone, E. A. Wallis Budge, (Dover Publications), c 1929, Dover edition(unabridged), 1989. (softcover, ) Budge. An Egyptian Hieroglyphic Dictionary, E. A. Wallis Budge, (Dover Publications), c 1978, (c 1920), Dover edition, 1978. (In two volumes, 1314 pages.) (softcover, )