The pivot turn
One of the first steps I learned in my beginner jazz class when I was about seven years old was the pivot turn. If you’re standing facing the audience (or mirror, or… whatever is “front”), you take a step forward with one foot (let’s say right) and then rotate your entire body over your opposite shoulder (in this case, left). Then once you complete the pivot, you are facing a completely different direction, and your legs have switched positions. You have done a 180. This is often used as a transition step within a combination before you set off into a more complicated series of movements. But if you pivot twice, you are exactly back where you started. I guess you can say that it’s what you do immediately after that first pivot turn that determines whether you really change course or not.