How many letters are there in the Hebrew alphabet?

The Hebrew alphabet known variously by scholars as the Jewish script, square script and block script, is an abjad script used in the writing of the Hebrew language, also adapted as an alphabet script in the writing of other Jewish languages, most notably in Yiddish (lit. "Jewish" for Judeo-German), Djudío (lit. "Jewish" for Judeo-Spanish), and Judeo-Arabic.

The Hebrew alphabet has 22 letters. It does not have case, but five letters have different forms when used at the end of a word. Hebrew is written from right to left. Originally, the alphabet was an abjad consisting only of consonants, but is now considered an "impure abjad". As with other abjads, such as the Arabic alphabet, scribes later devised means of indicating vowel sounds by separate vowel points, known in Hebrew as niqqud.