Can anyone identify this symbol or set of symbols?

http://imgur.com/tC7g7Sy Here it is. Well, my drawing of it anyway. It is on a piece of jewelry that I found when I was a child. I don’t remember where or when I found it, but I held onto it. This image appears on all 6 sides of a small, silver, rectangular prism. It is around the size of a cubic centimeter, but taller than a cube in shape and there is a small loop at the top to attach to a necklace or something. Can someone please tell me what this is, or what it means?