Pe
From BiblePortal Wikipedia
Hastings' Dictionary of the Bible [1]
PE . The seventeenth letter of the Hebrew alphabet, and as such employed in the 119th Psalm to designate the 17th part, each verse of which begins with this letter.
International Standard Bible Encyclopedia [2]
pā ( פּ , , פ ) ף : The 17th letter of the Hebrew alphabet; transliterated in this Encyclopedia as p with daghesh and ph (= f ) without. It came also to be used for the number 80. For name, etc., see Alphabet .