Inversions are elements of a rollercoaster that turn the train upside-down.
Types of Inversions
The corkscrew is an inversion that resembles a vertical loop that has been 'stretched' so that the entrance and exit points are a distance away from each other. The riders are inverted at a point angled 90° horizontally from the incoming track, but traveling in the opposite direction.
The most generic roller coaster element is the vetical loop. The loop is a continuously upward-sloping section of track that eventually results in a complete 360 degree circle. At the top-most piece of the loop, riders are completely upside-down.