43 characters in the Arabic Extended-B Unicode block.
U+0870ARABIC LETTER ALEF WITH ATTACHED FATHAU+0871ARABIC LETTER ALEF WITH ATTACHED TOP RIGHT FATHAU+0872ARABIC LETTER ALEF WITH RIGHT MIDDLE STROKEU+0873ARABIC LETTER ALEF WITH LEFT MIDDLE STROKEU+0874ARABIC LETTER ALEF WITH ATTACHED KASRAU+0875ARABIC LETTER ALEF WITH ATTACHED BOTTOM RIGHT KASRAU+0876ARABIC LETTER ALEF WITH ATTACHED ROUND DOT ABOVEU+0877ARABIC LETTER ALEF WITH ATTACHED RIGHT ROUND DOTU+0878ARABIC LETTER ALEF WITH ATTACHED LEFT ROUND DOTU+0879ARABIC LETTER ALEF WITH ATTACHED ROUND DOT BELOWU+087AARABIC LETTER ALEF WITH DOT ABOVEU+087BARABIC LETTER ALEF WITH ATTACHED TOP RIGHT FATHA AND DOT ABOVEU+087CARABIC LETTER ALEF WITH RIGHT MIDDLE STROKE AND DOT ABOVEU+087DARABIC LETTER ALEF WITH ATTACHED BOTTOM RIGHT KASRA AND DOT ABOVEU+087EARABIC LETTER ALEF WITH ATTACHED TOP RIGHT FATHA AND LEFT RINGU+087FARABIC LETTER ALEF WITH RIGHT MIDDLE STROKE AND LEFT RINGU+0880ARABIC LETTER ALEF WITH ATTACHED BOTTOM RIGHT KASRA AND LEFT RINGU+0881ARABIC LETTER ALEF WITH ATTACHED RIGHT HAMZAU+0882ARABIC LETTER ALEF WITH ATTACHED LEFT HAMZAU+0883ARABIC TATWEEL WITH OVERSTRUCK HAMZAU+0884ARABIC TATWEEL WITH OVERSTRUCK WAWU+0885ARABIC TATWEEL WITH TWO DOTS BELOWU+0886ARABIC LETTER THIN YEHU+0887ARABIC BASELINE ROUND DOTU+0888ARABIC RAISED ROUND DOTU+0889ARABIC LETTER NOON WITH INVERTED SMALL VU+088AARABIC LETTER HAH WITH INVERTED SMALL V BELOWU+088BARABIC LETTER TAH WITH DOT BELOWU+088CARABIC LETTER TAH WITH THREE DOTS BELOWU+088DARABIC LETTER KEHEH WITH TWO DOTS VERTICALLY BELOWU+088EARABIC VERTICAL TAILU+088FARABIC LETTER NOON WITH RING ABOVEU+0890ARABIC POUND MARK ABOVEU+0891ARABIC PIASTRE MARK ABOVEU+0897ARABIC PEPETU+0898ARABIC SMALL HIGH WORD AL-JUZU+0899ARABIC SMALL LOW WORD ISHMAAMU+089AARABIC SMALL LOW WORD IMAALAU+089BARABIC SMALL LOW WORD TASHEELU+089CARABIC MADDA WAAJIBU+089DARABIC SUPERSCRIPT ALEF MOKHASSASU+089EARABIC DOUBLED MADDAU+089FARABIC HALF MADDA OVER MADDA