Arabic Supplement is a Unicode block that encodes Arabic letter variants used for writing non-Arabic languages, including languages of Pakistan and Africa, and old Persian.
Umamaheswaran, V. S. (2007-07-26), "M50.4e", Unconfirmed minutes of WG 2 meeting 50, Frankfurt-am-Main, Germany; 2007-04-24/27, Names of characters in the range 0773 to 077D are changed by replacing the word 'EASTERN' with 'EXTENDED' in them.
Moore, Lisa (2010-05-19), "Action item 123-A50", UTC #123 / L2 #220 Minutes, Suggest clarifying text in section 8.2 of TUS 5.2 pp 248-249 regarding Yeh and Farsi Yeh joining groups.