Magic Forums

Hello everyone,

I hope this is the right section of the forums for my question.
Many years ago a friend of mine bought some tiny books about magic circles. Depending on what you wanted, you had to draw a specific circle with all kind of symbols.
Back then I needed money, and I was willing to try anything. To my surprise, it worked. Two days later I found some money on the ground.
Does anyone know what kind of circles I'm talking about? I need some help to find them! Sadly, my friend doesn't have the books anymore, nor does he remember how they were called.