A varial flip is a type of skateboarding trick in which the skateboard rotates around its vertical axis, or its vertical axis and its horizontal axis simultaneously. The first flip trick, called a kickflip but originally known as a "magic flip", was invented by professional skateboarder Rodney Mullen. General terms. The following is a list of general skateboarding terms that will assist novice readers to better understand the descriptions of flip tricks contained in this article: Frontside and backside.
https://en.wikipedia.org/wiki/Flip_trick