17 - pei sofīt
ף is the final form of the letter פ. It is pronounced /f/:
עוף (chicken) דף (page)
Words of foreign origin that end with /p/ are written with פ, not ף:
קליפ (clip)
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א ב ג ד ה ו ז ח ט י כ ך ל מ ם נ ן ס ע פ ף צ ץ ק ר ש ת