A sedge (M23), written on top of a mouth (D21).
Recognise a hieroglyph in your own photo →Sign drawings: NewGardiner font by Mark-Jan Nederhof (SIL Open Font License 1.1); signs missing there: © Serge Rosmorduc (from JSesh; LGPL / CeCILL, see notice). Transliteration font: Charis SIL (SIL Open Font License 1.1). Descriptions: Unicode Egyptian hieroglyph data (Unikemet).