Magic Circle

A Magic Circle of one kind or another is used in most Magic. First mentioned in Storm Front.

Description
A Circle helps a Wizard refine his magic, focus and direct it more clearly. It create a sort of screen, defined by a perimeter keeping random magical energy from going past it. It can be drawn on the ground or made by a several people holding hands, or a number of other methods. Then it's invested with a bit of energy to close the circuit.

In the Series
In Storm Front, Harry traps Toot-toot in a circle to bribe him with bread, milk and honey to get information for him on Victor Sells.