U+FB51 ARABIC LETTER ALEF WASLA FINAL FORM

U+FB51 was added to Unicode in version 1.1 (1993). It belongs to the block Arabic Presentation Forms-A in the Basic Multilingual Plane.

This character is a Other Letter and is mainly used in the Arabic script.

The glyph is a Final composition of the glyphs . It has a Neutral East Asian Width. In bidirectional context it acts as Arabic Letter and is not mirrored. The glyph can, under circumstances, be confused with 3 other glyphs. In text U+FB51 behaves as Alphabetic regarding line breaks. It has type OLetter for sentence and ALetter for word breaks. The Grapheme Cluster Break is Any.

The Wikipedia has the following information about this codepoint:

The Arabic script has numerous diacritics, including i'jam ⟨إِعْجَام⟩ (i‘jām, consonant pointing), and tashkil ⟨تَشْكِيل⟩ (tashkīl, supplementary diacritics). The latter include the ḥarakāt ⟨حَرَكَات⟩ (vowel marks; singular: ḥarakah ⟨حَرَكَة⟩).

The Arabic script is an impure abjad, where short consonants and long vowels are represented by letters but short vowels and consonant length are not generally indicated in writing. Tashkīl is optional to represent missing vowels and consonant length. Modern Arabic is nearly always written with consonant pointing, but occasionally unpointed texts are still seen. Early texts such as the Qur'an were initially written without pointing, and pointing was added later to determine the expected readings and interpretations.