Hebrew alphabet written from right to left. It has 22 letters, five of which use different forms at the end of a word. In the traditional form, vowels are indicated by the weak consonants Aleph (), He (), Vav (), or Yodh () serving as vowel letters, or "matres lectionis": the letter is combined with a previous vowel and becomes silent, or by imitation of such cases in the spelling of other forms. Also, a system of vowel points to indicate vowels (diacritics), called niqqud, was developed. In modern forms of the alphabet, as in the case of Yiddish and to some
Letters of the Living Abjad numerals system the letters of the Arabic alphabet are assigned numerical values. The Arabic letters h ح and y ي, which compose the Arabic singular adjective meaning "living" in the phrase Letters of the Living, add up to 18, and therefore the phrase "Letters of the Living" refers to the number 18. There is a similar symbolism about the numerical value of the corresponding Hebrew word in Judaism. The Báb referred to the 18 Letters of the Living, along with himself, as the first "Váḥid" of the Bayán Dispensation. In the Abjad numerical value of the word Wáḥid (واحد)