CAPH (kaf). The eleventh letter of the Hebrew alphabet, corresponding to our k. As a numeral it is eleven.

CAPH, KAPH käph (ך). The eleventh letter of the Heb. alphabet, having sound of k. The word kaph means “palm of the hand” in Heb., and its original form was a three-fingered hand. In the 9th cent. it developed an elongated diagonal stroke, and in this form was borrowed into the Gr. alphabet as kappa, from which the k in the Rom. alphabet was derived. As a numeral kaph expressed the value of twenty (20).

KAPH käf (ך כְ). The eleventh letter of the Heb. alphabet. It is transliterated in this encyclopedia as k. It was also used for the number twenty. In Psalm 119 it is used to introduce the eleventh part, and every verse of it begins with this letter.

International Standard Bible Encyclopedia (1915)

"k": The 11th letter of the Hebrew alphabet; transliterated in this Encyclopedia as "k", with daghesh, and "kh" (=German ch) without daghesh. It came also to be used for the number 20. For name, etc., see Alphabet.