the Arabic and Hebrew scripts sometimes perform the role of true alphabets rather than abjads when used to write certain Indo-European languages, including Kurdish, Bosnian, and Yiddish. Comparative chart of Abjads, extinct and extant See also Abjad numerals (Arabic alphanumeric code) Abugida Gematria (Hebrew & English system of alphanumeric code) Numerology Shorthand (constructed writing systems that are structurally abjads) References Sources External links The Science of Arabic Letters, Abjad and Geometry, by Jorge Lupin Arabic orthography