Question: The alphabet of which the letter Sad is a part includes how many letters?
Sentence (from "Arabic alphabet"): The Arabic alphabet (Arabic: الأَبْجَدِيَّة العَرَبِيَّة‎ ‎ "al-abjadīyah al-ʻarabīyah ", or الحُرُوف العَرَبِيَّة "al-ḥurūf al-ʻarabīyah ") or Arabic abjad is the Arabic script as it is codified for writing the Arabic language.
Relevant evidence: Yes