Helipop
A Backside 360 Nollie which was invented by Rodney Mullen. Its done by placing your front foot on the nose of the board and your back foot in Nollie Heelflip position. Then right before you begin the Nollie start to pivot just a little. Then begin your Nollie. If you can't get a full Nollie 360, try landing it in a 270 and pivot the rest of the way. Once you learned it good enough going 270, then go for the full 360. If you want to pivot at the end, never pivot on the nose, always do it on the back wheels. Variations: grabs, frontside, flips out.
Read more about this topic: Freestyle Skateboarding Tricks