The Arabic alphabet was formerly considered an impure abjad.
 Arabic is also widely used, sometimes as an abjad, as with Urdu and Persian, and sometimes as a complete alphabet, as with Kurdish and Uyghur
=== Abjads ===The largest known abjad is Sindhi, with 52 letters (28 letters of the Arabic abjad and 24 additional letters) for 62 phonemes (16 vowel sounds, and 46 consonant sounds); vowels are not fully distinguished in writing

