The H.T.P. Hieroglyph

Extract from The Little Book of EGYPTIAN HIEROGLYPHS (L&R ADKINS) :"The last two consonants of a trilateral could be repeated by phonetic complements...An example of a trilateral is (heiroglyph of loaf on mat), which represents the letters 'htp', and this could be accompanied by the phonetic complements [of] the letter 't' and the letter 'p'."

HTP in Egyptian hieroglyphs