I was reading an article about a problem with Mac and iOS. Why does this string of Arabic characters
crash Mac computers running Safari?
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As the arstechnia link to ycombinator page states, it is a "bug inside Apples CoreText font rendering framework".
This post on a Russian website drew attention to it: http://habrahabr.ru/post/191654/
The comments under the ycombinator article are the most interesting, with one reader pointing out that this bug is already fixed in Mavericks
Also, if I had enough reputation, I would downvote your question for putting an offending string in the question and thus risks causing a crash for some apple.stackexchange.com readers. A slightly malicious or somewhat stupid move on your part, I dare say.