The Unicode Consortium Discussion Forum

The Unicode character code is required for these Arabic letters

ټـ ARABIC LETTER THE WITH RING INITIAL FORM
 Pashto
ـټـ ARABIC LETTER THE WITH RING MEDIAL FORM
 Pashto
ـټ ARABIC LETTER THE WITH RING FINAL FORM
 Pashto
ځـ ARABIC LETTER HAH WITH HAMZA ABOVE INITIAL FORM
 Pashto
ـځـ ARABIC LETTER HAH WITH HAMZA ABOVE MEDIAL FORM
 Pashto
ـځ ARABIC LETTER HAH WITH HAMZA ABOVE FINAL FORM
 Pashto
څـ ARABIC LETTER HAH WITH THREE DOTS ABOVE INITIAL FORM
 Pashto, Khwarazmian
ـڅـ ARABIC LETTER HAH WITH THREE DOTS ABOVE MEDIAL FORM
 Pashto, Khwarazmian
ـڅ ARABIC LETTER HAH WITH TREE DOTS ABOVE FINAL FORM
 Pashto, Khwarazmian
ـډ ARABIC LETTER DAL WITH RING FINAL FORM
 Pashto
ـږ ARABIC LETTER REH WITH DOT BELOW AND DOT ABOVE FINAL FORM
 Pashto
ـړ ARABIC LETTER REH WITH RING FINAL FORM
 Pashto
ښـ ARABIC LETTER SEEN WITH DOT BELOW AND DOT ABOVE INITIAL FORM
 Pashto
ـښـ ARABIC LETTER SEEN WITH DOT BELOW AND DOT ABOVE MEDIAL FORM
 Pashto
ـښ ARABIC LETTER SEEN WITH DOT BELOW AND DOT ABOVE FINAL FORM
 Pashto
ګـ ARABIC LETTER KAF WITH RING INITIAL FORM
 Pashto
ـګـ ARABIC LETTER KAF WITH RING MEDIAL FORM
 Pashto
ـګ ARABIC LETTER KAF WITH RING FINAL FORM
 Pashto
ڼـ ARABIC LETTER NOON WITH RING INITIAL FORM
 Pashto
ـڼـ ARABIC LETTER NOON WITH RING MEDIAL FORM
 Pashto
ـڼ ARABIC LETTER NOON WITH RING FINAL FORM
 Pashto
ـېـ ARABIC LETTER E MEDIAL FORM
 Pashto, Uighur
ـې ARABIC LETTER E FINAL FORM
 Pashto, Uighur

Initial, medial, and final forms can be created by adding a Zero Width Joiner (U+200D) directly adjacent to the regular letter. The ZWJ acts as an invisible joining character that changes the context for any adjacent letter, so put it both before and after a letter to get the medial form, before the letter to get a final form, and after the letter to get the initial form.