Subject: bug#22681: Shows right-to-left text characters in the wrong order

From: Eli Zaretskii <[email-masked]>
Date: Mon, 15 Feb 2016 20:23:57 +0200

> Date: Mon, 15 Feb 2016 11:27:52 -0600
> From: Andrew Pennebaker <[email-masked]>
> 
> The Arabic word for dog is al-kalb (الكلب), but when I try to insert this word into an otherwise left-to-right
> document, Emacs renders the characters of al-kalb backwards, forming nonsense.

Do you see the same with the Arabic and Hebrew greetings in the buffer
presented by the "C-h H" command?

Anyway, this sounds like something OS X specific, because on my system
(which is not OS X) the Arabic word you cited is displayed in its
correct visual order.