It turns out the “Arabic writing” is neither Arabic nor writing, and scarcely resembles Arabic writing. Rather, it looks like a stylized drawing of a sword.
UPDATE: I forgot to mock the people who think there are mysterious Arabic symbols. Arabic is a language. It has writing. There are no Arabic symbols. So no job for a Tom-Hanks-style Dan Brown mystery Angels and Demons kind of *symbologist*, more’s the pity.