Yesterday, at work a colleague was wearing a pendant shaped like a hand and she asked me if I had heard of it and what it was called in arabic (assuming that I knew arabic since I'm a muslim). Ignorantly, I told her that I had never seen it and didn't know what it was called. She told me that it has a 'significance' for both jews and muslims. She was half jewish and half something.
I found out later in the day that its called 'Hand of Fatimah' (Prophet Muhammed's daughter) or 'Khamsa (Five)' in Arabic. Apparently, it is used for protection against evil eye and any other evil, especially for girls. It has an eye at the back of the hand. It is usually worn by Algerians and is very famous in France. I can see why women like to wear it, its a very beautiful piece of jewelry.
Being a non-superstitious muslim, I knew this was a load of crap and a piece of some jewelry can't prevent evil from happening to you. But this was something that I hadn't heard of and it was an addition to my not-so-vast knowledge.