A vert ramp is a form of half-pipe with vertical in it and its used in "extreme sports" such as Vert Skating, Vert Skateboarding and Vert BMX.
Vert ramps are so named because they transition from a horizontal plane (known as the flat-bottom) to a vertical wall.
The typical height of a vert ramp is 12 ft (3.7 m) - 15 ft (4.6 m) with anywhere from six inches (152 mm) to three feet of vertical on the top.
This vertical transition makes it easier for the rider to take off and 'catch air' on a vert ramp rather than on a half-pipe. This is because the vert at the top causes the rider to naturally go straight up into the air instead of forward and off the ramp (as is the tendency on a half-pipes that does not go up to vert).