This symbol has a couple of uses in writing ancient Egyptian. The most common use is probably as a determinative. Ancient Egyptian, much like many Semitic languages, omits the vowels in a word in writing. Determinatives are ideograms that disambiguate between several words with the same consonants but different meanings. This symbol is used to denote maleness or strength. For example, 𓂓𓏺 is ka for "spirit." 𓂓𓂸 is ka for "bull." (We could also add 𓃒 to 𓂓 for "bull" in addition to or instead of 𓂸)
Phonetically, Egyptian hieroglyphs use what's called the Rebus principle. For example, in English we could write https://i.imgur.com/Rp51iOt.png (hn ate my emoji) for belief. When this symbol is used phonetically, it represents the consonants "mt" because the ancient Egyptian word for phallus used those consonants. If we wanted to write "phallus," we could write 𓂸𓏺 with the stroke afterwards to denote that we mean the symbol, not its phonetic value.
Edit: hn cut out my emoji unicode. Replaced the emoji unicode with an image link.
