Pin Wheels

Pinwheels can be a toy, cookie, sandwich, or agility jump pattern.  

There are many different types of bar jump patterns in agility courses.  One of the most common is a pinwheel pattern, typically consisting of three jumps:

Of course, there are also many variations of this pattern, but this is the most standard.  If you are the handler, the best place to be is in the inside of the jumps so that you can direct your dog through the pattern with fewer footsteps.  This is often called being "inside the box."

For a great article about pinwheels, check out this article from AgilityNerd: Pinwheels