RAV KOOK ON Bechukotai Part 1: Prophetic Letters

Five Double Letters Of the 22 letters in the Hebrew alphabet, five are called ‘double letters,’ as they take on a different form when appearing at the end of a word. The five letters are Mem, Nun, Tzadi, Pay, and Chaf. When placed together as one word, they spell M-N-Tz-P-Ch.